Put in your time, crew, travel and costs. Get a defensible per-visit price with a proper margin — plus what you’re really earning per hour, and the annual value if it’s a recurring round.
Margin is on the sell price, the way accountants mean it — a 30% margin, not a 30% markup on cost.
Charge this per visit (ex VAT)
£74.29
From your own costs, crews and kit. Then it schedules the round and invoices the work.