I'd add an extra £50 on the job to get the guy some decent clothes to wear for commercial jobs like that. Indeed any job.
I take it you don't like his bobble hat then 

Just looks a bit amateurish, but thats just my opinion.
Good job though, wonder how much water it uses? And jobs like that are great for cash flow. A lot of the bigger jobs we do are really good payers, helps no end. And with 'GoCardless or else' threats for the smaller ones who take ages to pay has improved things no end.
Glad I don't have to work weekends though. Might go canvassing in a bit actually
