The Lemon Fool

Does anyone know if it is possible to transfer SIPP providers once you have crystallised pension funds?
It occurred to me we spend a lot of time optimising charges etc in accumulation phase, and transferring accounts to the best place, but I am not sure if it is even possible to do this once you have started taking a pension?
Means that the choice of provider if you are approaching taking benefits becomes even more important.

It is entirely possible to change SIPP providers after drawdown has commenced.
Indeed, there is often a transfer bonus from the new company (AJ Bell will pay £500 for example) which can offset transfer-out fees from the old company.
Other pensions in payment such as annuities are not usually transferrable though.