Charles Stanley has been the cheapest percentage based platform that offers a SIPP to invest from for a long while. How will their recent price hike change things? Who is the best investment platform? Investment platforms are really complicated. They each have different rules and prices depending on different pot amounts and transactions. You won’t find a ‘here’s the price’ type statement on any platform. Basically, all of the platforms have different fee structures between an ISA and a SIPP; it’s messy!...