Struggling!
5 D. Salt's needed by London district to get road working (10) t----ol---
(I'm thinking it begins 'tar' and ends 'on', but that's as far as I've got.)
24 A. Must see Asian ceramic glaze that's colourful (6) --n-a-
4 D. No head managed article in paper (4)
-pe- (The 'p' might be wrong)
1 D. A fool in hoary tale, one that goes on a bit (7) --b-e-t (Can see 'gabfest', but don't get the link with 'fool...')