Clear blocked washing machine waste pipe & secure hose - E6

Washing machine drain hose came out of the open standpipe (upstand) and flooded the floor. A previous plumber found debris build-up in the standpipe restricting flow, so water backs up and pushes the hose out. The hose has been pushed back in as a temporary fix only. Fourth-floor flat in East Ham, New Market Place (lift access). The flat is tenanted, so access will be arranged with the tenant / letting agent. Weekday daytime is fine. Please give TWO fixed prices, including parts and VAT (if applicable): QUOTE A – Essential work only - Pull out the washing machine - Clear the standpipe and waste run with a mechanical worm / drain snake - Refit the drain hose and secure it so it cannot come out - Run a full test cycle to confirm it drains freely with no leaks QUOTE B – Full job - Everything in Quote A, plus - Supply and fit a sealed spigot connection with an air admittance valve, and connect the drain hose to it Please also tell me: - Your earliest availability - Whether you can provide an invoice/receipt and a short note with photos of the work (I am a landlord based outside London) - Any extra charge if the blockage turns out to be further along the pipe