So must be one of the houses opposite houghton close ? Looking via Google maps and taking an educated guess at a conny size would be at a pinch £125 + vat
Things to consider - people lie, even if the windy did them last year for £60, why now is he happy to pay you more ? In the past I've had people say this sort of thing, but other than a token £5 off my price is the price because you start dropping the price you look like you overcharged in the first place and many a time these people then ring up a few days later and book a clear at your price.
If they are rammed, perhaps they were not cleared at all, or badly cleared and did he reach over the conny to clear
Whether you do the job, and at a price you feel is too skinny is your choice, after all us lot on here are not paying your bills if you don't get it, if you need the work, or doing it for experience then give it a bash for £70
There will always be people who underrate your service, if you let them bully you on price you'll always be working cheap
Darran