Vanguard UK is a great option for simplicity. You can buy the Global All Cap fund directly, set up an ISA or SIPP, and automate everything in minutes.

Is it the cheapest? Not always—especially if you’re starting with small amounts. There are free SIPPs and ISAs available on platforms like Trading212 and Invest Engine.

We love Vanguard for its simplicity, but if you want the full breakdown of costs and features, read our full platform review here