Also another question I’ve switched pension provider at work and have a sum with old pension provider - was thinking of moving it to Vanguard. Anyone done something similar?
Yes. In process of moving to ii.co.uk as cheapest platform for my situation. A few forms to fill in and it will take time but they're responsive and have been helpful so far.
Have a look on the Monevator website for SIPP comparisons.
Also another question I’ve switched pension provider at work and have a sum with old pension provider - was thinking of moving it to Vanguard. Anyone done something similar?