It’s a weird time. Only you know what your risk appetite is and your future plans. If you want to move in the mid term then I’d think carefully before signing up for a five year fix.
Some (many?/most?) mortgages can be moved to another property within the fixed period, so unless you're moving to another country or getting out of ownership completely you still have some freedom to move.
I have no idea what I’m doing, it’s just what I hear and you lot are smarter than me so came looking for answers...