Thank you so much for more advice :) Sorry for the lack of updates - my DS and now SpriteCat are keeping me busy.
He came out properly Sunday night for a good fuss. It was so sweet - I went over to him and all of a sudden he chirruped at me and came out, tail raised high. Still nervous, but very much wanting to be friends.
He purred like a little machine. He is a lot bolder now - these last couple of days he's hardly been running away and while still cautious, he's definitely showing a cheeky side!
He did his first scarily huge poo last night, so got lots of praise for that. He's eating well, after a shaky start where he turned up his nose at Waitrose(!) cat biscuits and would only accept Hills Science Plan dry food.
He doesn't want picking up yet, and is doing a lot of crouching his rear end down, sort of slinking about - what does this mean? Assuming it means he is trying to be submissive? He is letting me stroke him though, without crouching down to avoid my hand.
He has the sweetest little miaow. He seems to be quite playful, and has nibbled me a couple of times and batted at my hand, with claws out. He's been doing it gently, but obviously I want to discourage this behaviour. Is this normal, and any suggestions? My great big wuss of a husband called me downstairs in a panic because the kitten was running around his feet, 'trapping' him in the room! He is terrified of being scratched, silly man - I've tried to explain SpriteCat is only playing, and isn't trying to hurt, but my FIL brought DH up to be nervous of animals. Typically SpriteCat seems particularly drawn to DH, because he thinks DH dancing around trying to avoid him is actually a game - haha!
Picture - I'm on the case!