So it was WBAC that bought a 35i for £2,750, not one of your clients? I'm not sure that's really relevant in a discussion about what the going rate is....I was contacted originally after a bird strike with an oil leak from a 'cracked' OFH.. I was offered it for £5.5k.
I just struggled with what I'd do with it given a single garage, no real flat parking space and of course my existing Yellow Peril..
The chap then discovered that the bird strike was nothing to do with the OFH..he put a fresh gasket..roof wouldn't work.
In the end he gave it to WBAC for £2,750..on the day the roof operated fine..