Ok, update.
I got home from work around 8pm and he was there waiting with his van parked where. Usually park (clearly being an arse)
When he saw me pull up he gets out and from his van and waits by my gate.
Holding the envelope up and saying/shouting "what is this? It's not even £240, you have only put in £225" I. Tell him, no I put into £240 "don't call me a lier he shouts in my face. he then demands I have until midnight to pay the remainder or else he starts the court proceedings, I reply "OK"
He then proceeds to shout at me saying how he's going to take me to court etc, meanwhile I stay calm whilst he is ranting pointing at me, a guy I had coming round to look at some electrics for me stands in my garden, the neighbour becomes aware of him but carries on ranting not letting me get a word in edgeways saying how he is going to get a decorator in to quote the work and I will pay for it, I let him let off steam, then ask him to count the money, he counts £225 I say do it again, he gets it to £240, counts again, it's £240 I ask for an apology for calling me a lier.
then I put my point forward as to why I won't pay,
After lots of him shouting and me not raising to it, he slowly starts to calm a little.
And now I can talk.
It goes on for a while.
The outcome is he has dropped the £10 I don't need to pay for the decorating, there is no court proceeding, we shake hands and agree to let it go and move on.
RESULT
Thank you all for your opinions.