Why Index Funds for UK Investors?
An index fund is a type of investment fund that tracks a stock market index — such as the FTSE 100, the S&P 500, or the MSCI World — rather than trying to beat it. Instead of a fund manager picking individual stocks, the fund simply holds all (or a representative sample) of the stocks in the index, in proportion to their size.
The evidence for index funds is overwhelming. Over periods of 10 years or more, the vast majority of actively managed funds underperform their benchmark index, after fees. The reason is simple: fees compound against you just as returns compound in your favour. A fund charging 1.5% per year has to outperform the index by 1.5% every single year just to break even with a low-cost tracker.
For UK investors, index funds are best held inside a Stocks and Shares ISA to shelter all gains from Capital Gains Tax and dividend tax. All of the funds below are available inside an ISA on major UK platforms.
We selected funds based on: annual cost (TER), assets under management, diversification, track record, and availability on major UK platforms. We have no commercial relationship with any fund provider. All figures are correct as of April 2025.
1. Vanguard FTSE Global All Cap Index Fund
Vanguard FTSE Global All Cap Index Fund
The Vanguard FTSE Global All Cap is the closest thing to a single, perfect fund for a UK investor who wants to own the world's stock market and nothing else. It holds over 7,000 companies across developed and emerging markets — from Apple and Microsoft to smaller companies in Japan, Korea, and Brazil — all in a single fund.
The 0.23% TER is extremely competitive, and the fund automatically reinvests dividends (accumulation units), meaning compound growth happens without any action required on your part. It is available directly through Vanguard's own platform (where the total annual cost is 0.23% + 0.15% platform fee = 0.38%) or through platforms like Hargreaves Lansdown, AJ Bell, and others.
Best for: Beginners and experienced investors who want a simple, one-fund global portfolio. This is the fund Warren Buffett recommends for most people (in its US equivalent form).
2. iShares Core MSCI World ETF (SWDA)
iShares Core MSCI World ETF (SWDA)
The iShares Core MSCI World ETF (ticker: SWDA on the London Stock Exchange) tracks developed market stocks across 23 countries. It does not include emerging markets, which makes it slightly less diversified than the Vanguard Global All Cap, but it has a marginally lower TER at 0.20%.
It is one of the largest ETFs in the world by assets under management, which means excellent liquidity and very tight bid-ask spreads. It trades on the London Stock Exchange during market hours and is available on virtually every UK investment platform.
Best for: Investors who want a pure developed-world exposure or who prefer trading ETFs on an exchange rather than holding a traditional fund. Ideal on platforms like InvestEngine (zero platform fee for ETFs).
3. Vanguard FTSE All-World ETF (VWRL / VWRP)
Vanguard FTSE All-World ETF (VWRP)
VWRP (the accumulation version of VWRL) is Vanguard's flagship global ETF, covering both developed and emerging markets with over 3,700 holdings at a 0.22% TER. It is one of the most popular funds among UK passive investors for good reason — it is extremely broad, very low cost, and backed by the world's largest fund manager.
The main difference from the FTSE Global All Cap is that VWRP does not include small-cap stocks, covering only large and mid-cap companies. In practice, this makes very little difference to long-run performance.
Best for: Investors looking for a globally diversified, low-cost ETF that includes emerging markets and is available on all major UK platforms.
4. Fidelity Index World Fund
Fidelity Index World Fund
With a TER of just 0.12%, the Fidelity Index World Fund is one of the cheapest ways to access global developed market equities in the UK. It tracks the MSCI World index and is available through Fidelity's platform as well as through other brokers.
The ultra-low cost is particularly valuable for larger portfolios, where even a 0.10% difference in annual fees translates to a significant sum over time. On a £100,000 portfolio, the difference between 0.12% and 0.22% is £100 per year — which itself compounds.
Best for: Cost-conscious investors, particularly those with larger portfolios where small differences in TER have a more meaningful impact.
5. HSBC FTSE All World Index Fund
HSBC FTSE All World Index Fund
The HSBC FTSE All World Index Fund offers global coverage including emerging markets at just 0.13% per year — making it one of the cheapest globally diversified funds available to UK investors. It tracks the same FTSE All-World index as Vanguard's VWRP but at a lower cost.
It is available through Hargreaves Lansdown, AJ Bell, and other major UK platforms inside a Stocks and Shares ISA.
Best for: Investors who want global coverage including emerging markets at the lowest possible cost.
6. Vanguard UK Government Bond Index Fund
Vanguard UK Government Bond Index Fund
Not all investors should be 100% in equities. As you approach retirement or have a shorter time horizon, adding bonds to your portfolio reduces volatility. The Vanguard UK Government Bond Index Fund provides exposure to UK gilts (government bonds) at a very low 0.12% TER.
Bonds tend to rise when equities fall (though not always), providing a stabilising effect on a mixed portfolio. A common rule of thumb is to hold your age as a percentage in bonds — so a 40-year-old might hold 40% bonds and 60% equities.
Best for: Investors approaching retirement, those with lower risk tolerance, or anyone looking to balance an equity-heavy portfolio.
7. iShares Core FTSE 100 ETF (ISF)
iShares Core FTSE 100 ETF (ISF)
At 0.07% TER, the iShares Core FTSE 100 ETF is one of the cheapest investment funds available anywhere in the UK. It tracks the FTSE 100 — the 100 largest companies listed on the London Stock Exchange — and pays quarterly dividends.
We would not recommend the FTSE 100 as a sole investment, as it is heavily concentrated in the UK (which represents only about 4% of global market capitalisation) and in a few sectors like financials, energy, and consumer staples. However, it can be a useful component of a broader portfolio, particularly for investors who want UK currency exposure or who believe UK equities are undervalued relative to global peers.
Best for: A small UK tilt within a globally diversified portfolio, or for investors who specifically want exposure to large-cap UK dividend payers.
8. Vanguard LifeStrategy Funds (20% – 100% Equity)
Vanguard LifeStrategy Range
The Vanguard LifeStrategy range offers five funds with different equity/bond splits: 20%, 40%, 60%, 80%, and 100% equity. Each fund is a fund of funds — it holds a basket of Vanguard index funds — and automatically rebalances to maintain the target allocation. The TER of 0.22% applies across the range.
LifeStrategy funds are popular because they provide instant asset allocation in a single fund. The 100% equity version is essentially a global index fund with a UK tilt. The lower equity versions add progressively more bond exposure, reducing volatility but also expected long-run return.
Best for: Investors who want a complete, one-fund portfolio with a set risk level, without needing to manage rebalancing themselves.
Where to Buy Index Funds in the UK
All of the funds above are available through major UK investment platforms inside a Stocks and Shares ISA. The best platform for you depends on how much you are investing and how often you plan to trade:
- Vanguard Investor: Best for holding Vanguard funds directly. 0.15% platform fee, capped at £375/year. No trading fees for funds.
- InvestEngine: Best for ETFs. Zero platform fee for DIY investors. Only offers ETFs, not OEICs.
- Hargreaves Lansdown: Most comprehensive platform. Higher fees (0.45% up to £250k) but excellent service and the widest range.
- AJ Bell: Good middle ground — 0.25% platform fee, wide fund range, lower trading fees than HL.
Which Fund Should You Choose?
For most UK investors, the simplest and most effective choice is the Vanguard FTSE Global All Cap Index Fund or the iShares Core MSCI World ETF. Both give you genuinely global diversification at a low cost, automatically reinvest dividends (in accumulation form), and have decades of track record behind them.
The exact fund matters far less than getting started, staying invested, and contributing regularly. Use our compound interest calculator to see how even modest monthly contributions grow over time — the numbers are often more motivating than any guide.