Of the 10 airfields I have flown to in the last month, only one has come in at £10, and that was a tiny grass strip. All the others were more, even in a tiny 2 seat tomahawk.
Albeit, I've been to some commercial airports, such as Exeter charging £20, and Manston charging £14, Guernsey still offers the same services for £10
I would love to fly to Guernsey, and on the basis of the thread may do this week if the weather improves. £10 for the sort of service spoken of on this thread sounds a bargain, however it is broken down.