Yes, you can invest in a huge range of index funds (including Vanguard funds) when you have a GIA, ISA or SIPP account with Interactive Investor.
Interactive Investor Index Fund Investing Review

Name: Interactive Investor Index Fund Investing Review
Description: Interactive Investor offer a wide range of index tracker funds. You can either pick your own or choose from some featured funds from their Super 60 investment list.
Capital at risk.
Summary
A good choice for large index fund portfolios, as they offer good coverage and the fixed-fee model means that the bigger your account size gets, your costs stay the same.
Fees: *Fund dealing commissions are a free trade every month, then charged £7.99 or upgrade to a £19.99 “Super Investor” account 2 free monthly trades and deal for £3.99. Regular investing is free.
Pros
- Fixed account fee of £9.99*
- £1 minimum deposit
Cons
- Fixed fee not great for very small accounts
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Overall
4.1- Expert opinion: Interactive Investor reviewed & rated