RE: Bed and ISA6 Apr 2021 12:45
Just be aware that as soon as you take money (profits) out of an old ISA, the tax-free status of that money comes to an end. You could of course put it into another ISA for the current tax year (up to the £20k limit on contributions), but if you buy more shares outside of the ISA wrapper then any profits on those will be liable for CGT (subject to your annual allowance of course).
Alternatively you can sell shares within an ISA, keep the proceeds within the ISA and then buy more shares to keep the tax-free status intact. The ISA is an investment vehicle which if all trading is done within it, retains its tax-free status. Note, this is my personal understanding, I am not qualified to give tax or investment advice.