Roger,
I wouldn't get your hopes up, mate, I've been asked to quote too; I'm off to see the job tomorrow, I didn't know they were getting other quotes in; the sneaky gits.
I also used to clean Chepstow Castle, so I've experience in this area; which is a point I'll be pushing when I quote.
Sorry, mate; but I bet the best looking window cleaner gets it; so that'll be me.