Well blow me! I found the issue. With the mot looming, thought I’d better get my finger out!
As above, a fuse for the windscreen washer pump is not listed.
Now during winter last year I removed the fuse for the rear wiper because 1/ I never use the rear wiper and 2/ if the front wipers are switched on, the rear wiper automatically operates when reverse gear id selected. As I often reverse from my drive, This can put strain on the rear wiper and blade if the rear window is frozen.
anyways, I refitted the fuse (number 47) hey presto, washers are working again.
Odd that there's no mention of a fuse for the windscreen washers. Hope this might be of use if somebody searches for same issue on a 2012, 8v.