Great tips, thanks. Interesting (but minging) to hear about the disgusting houses people have moved in to. Definitely not 'that' seller. Also, can't believe (or I probably can) some of the things people have taken with them on moving. Crazy.
Wouldn't occur to me to take 💡 so they'll be staying, along with some spares which won't fit new house. Most of the curtains will be left as they won't fit the new house. We may take a few pairs, like kids bedroom curtains, but haven't measured the new house yet , however, all windows have some type of blinds (including black out in the bedrooms) which will be left.
Good idea about the loo roll/soap.
Good idea about the file with all the appliance etc info.
Wouldn't have thought about paint, so that's great. Also have a few spare bathroom/roof tiles in the garage which we'll see if they want to keep just in case they're ever needed. Planning on getting rid of a few cupboards, old freezer / fridge freezer / bed settee so will ask if they want them keeping or getting rid of.
Should be ok with the post cos we're good friends with one neighbour so will just ask if they'll pass it over to them & we can collect.
I don't think leaving something is a thing but I think it's a nice gesture. Would probably be a bottle rather than flowers for practical reasons. There's a chance when we visit our neighbours after we've moved that we might meet the people who've moved in & it's nice to be nice. Glad some people appreciate the thought . It will however depend on what they're like as vendors, if they're shit, won't be leaving wine.
Will make sure to get rid of the minging bog brush 
No cats to redirect, no dogs to clear up the crap (except the occasional 💩 left in the front lawn by twats taking their dogs out & letting them crap wherever ).