We have about £70k in s&s isas that was supposed to be long term savings. It has gone down in value. over last year. I am now thinking that we may use a substantial chunk eg £50k towards mortgage when fix ends in 2025. In the meantime, I’m wondering whether to tfr (if possible?) to a fixed rate cash Isa to be certain of a 2-3% return rather than risk further loss. Is that possible/crazy?