Yes, you can still transfer your ISA to a new provider.
If you transfer your current-year ISA, we will tell your new provider how much more you can deposit within the tax year. This will include any withdrawals made that can be repaid with the new provider.
How to transfer a cash ISA
Withdrawals made against previous years’ deposits can’t be transferred to the new provider. If you want to transfer these, you’d need to replace these before making a transfer.
Previous years’ withdrawals can be repaid with Nationwide if you open a new Nationwide ISA product within the tax year.