Hi guys thank you all for the replies.
I didn't come into this fully expecting to go to court and win loadsa money or anything like that, just wondered where I stood being unsure of legalities.
I don't think on reflection small claims would get me anywhere but I am likely to try and pressure him somewhat and take a chance, he may well tell me to get gone but worth a go and I'll of course keep it entirely amicable... worth a go.
If not, 1k it is to put it right, if I could get him to pay half then that would have course be good. Rybo I think a thousand quid isn't a "cheap job" if done in a well respected bodyshop? As said that'd not include painting the roof, bootlid, back bumper as they are fine.
I absolutely do agree I take some blame here do not think for a second I don't feel stupid for rushing it due to time and effectively ignoring the weather as this is the first car I've bought out of ten to which I've had an "issue" with... but my bad as well I'm the first to hold my hands up there, as my OP states. But on the flip side I tried to show the seller I was genuinely interested and on the basis of taking it that day it was down to the paintwork being issue free.
Obviously pre-viewing I asked about the paintwork, any issues, scratches, dents etc. To which he said none. I didn't ask if it had seen any fresh paint since it left the factory. Then viewing the car he was well aware I was ready to walk and again verbally I asked about paintwork, any issues/problems/dents/scratches... again he claimed all was good and nothing to note of major issue.
Then once cleaned/dried the microblisters were apparent as described and a poor bumper repair, rattle canned etc. I again asked has this car ever seen paint and has the bumper been repaired and again he said no to both, just some "common laquer peel" on the front bumper, which is actually a bad repair with sunken filler. As said though this is post sale.
Anyway thank you all for your help and opinions, I just wanted to know where I stood, I understand it is how it is with a private sale, which is why I ALWAYS write the buyer a clear receipt stating no warranty, no returns, sold as is and sold as seen. The seller of the Focus didn't give me a receipt.
I shall let you know when I have spoken to him. I was going to call but wondering wether to text so it's in "black and white" and yep I've taken screenshots of anything useful from the STOC.