if that's outside of the time you'll be with the trust, you can rearrange them
if by my calculations you handed your notice in tomorrow, you would be leaving on the 22nd feb (my birthday xD) which means the holidays you have in march you would either need to rearrange or lose.
HOWEVER if you're moving jobs within the NHS ie to a different department or trust, your new manager should honour them IF you told them about it during the interview, if not, they're not obliged to honour it.
if you're moving out of the NHS for your new job into a private company, again you need to tell them but some private firms don't pay you for annual leave like the NHS does (one good thing about working for them)
you're best speaking to your new manager first and asking if those holidays could be honoured, if not, speak to your current manager about rearranging the holidays as they should let you do it. if not, your manager's crap to be honest... as it's your right to use them A/L days, however there is a stipulation that it also can't leave the department dangerously short staffed.
just out of curiosity, where/what dept is it you work at (PM me with the details if you don't want to mention it)