I tried to do it a year ago, and as you say no exit charges. Unfortunately Mrs londonstache works for a big financial firm who are FCA regulated, and this firm has not put Vanguard on their "approved" list, so I can't transfer investments to them (although I'm allowed to hold Vanguard funds - my guess it that they are a competitor). Given SIPP and ISAs are all in Lifestrategy funds, this is more than a bit annoying, so I'm still with HL
But to your original question, you should be fine.