last few:
27a. Ant & Dec regularly recorded upbeat rock openers, mixed with Berry ?e?c?r????
22d. mad star ?a??
23d. Get upset about place of admission ?e??
last two assume the a and e are from 25a. PW in bed? for which I have pillowcase
I thought of rats as well, but redcurrant is correct for 27a. giving a as the final letter of 22d.
Only thing I came up with for 23d was vent but not sure this is correct