65 pounds an hour + VAT is perfectly acceptable IMHO, wouldnt pay that myself for basic spannering like this of course, but its less than most main dealers for example, but as martin says if they reckon it took them 2.5 hours to change a simple hose, then Id be calling trading standards if you can really do it in 20 mins on the same car.

When doing so, Id video someone taking it off and on again (not joking either!) just to show how simple it is.