The small print/boring bits.

My standard rate is based on a 10 hour day, unless agreed otherwise beforehand. Anything over this will be charged overtime at 1.5x based on a 9h working day with 1h lunch. 

I will invoice as soon as possible after a job, and payment is due within 30 days of the invoice date, unless agreed otherwise beforehand.

If the invoice is not paid according to the agreed terms I reserve the right to charge interest and late payment fees, following the Late Payment of Commercial Debt Act. Most recent guidance on the UK Gov website here.