Is this possible?
I believe it is possible but only within the annual cash ISA investment limit of £5k.
So if you have say £20k in an equity ISA, you cannot transfer it to a £20k cash ISA. You could sell the shares and end up with £20k in a cash account of some sort but you have crystallised the capital gain there and then, and the cash is just sitting in the dealing account earning little or no interest.
Is that correct?