Right, reckon I can make this!
I arranged cover for my on call only to realise my parents are coming over at 1500!
So, I think I'll do the ride down to the pub, natter, poss. have lunch, and then not head to the beach but ride home up the B2141/B2146 to Petersfield, then A272/A32 and then time depending either straight home from Alton, or do the more interesting route. I reckon I can do all that and get home by 1400 or shortly after. (Certainly well before 1500 when my parents arrive.)