Barclays Smart Investor - for expats

We have investments with Barclays - SIPP, Market Master and ISA - all shares that are traded regularly. Today we have just received notification that as we are non-resident from the 28th August we will no longer be able to manage these accounts. So our choice is to leave them there and let the Gos do as they will or move to another provider??!! Anyone else going through this...and where do we look for a provider that will take on ISAs that we cannot make contributions too, but rather only trade within???
This feels rather like we are being POOPED on by a main player who has decided to change the rules, as 40 years of retirement savings are at risk here!!
Thanks for any help - suggestions