Ian,
No offence taken, down here we can't get anywhere near those prices!
The job doesn't require sanding, although I did ask why... no mention of weedkiller.
I did a single job last year for a sealing company It was 1200 sq mtrs I did it single handed in just under 2 days and they were by no means early starts and late finishes. the client was delighted as all my clients are. Oh and I don't normaly give figures but i charge him £1 per sq mtr normally, but as this was a bigger job he negotiated me down to 75 pence for 2 days work I was happy, no measuring or pricing, no sanding and no going back for payment when custy is home.
(In actuall fact it was something like 1120 sq mtrs)
To be fair I must point out that I work from a van mounted pump and holding tank. I have about 11 10mtr (includes a couple of 15mtr) HP hoses and 3 x 35 mtr water hose reels. When I get to job I jump out of van connect to tap pull whurlaway out grease it then start cleaning.
The job above was right next to a water pumping station and the flow was fantastic I'd say about 23 litres a min. but if water is less than 15 ltrs a min I use the time waiting for tank fills brushing up and moving stuff.