Whats it worth?

There's one on boatsandoutboards 'as new' for £350 - that's the areodeck model. A slatted floor would be less than that.

I bought a new one with aerodeck three years ago and that was £540 from Barnet Marine (now in Welwyn Garden City).
 
I guess you have to ask how old it is, but I would start the bidding at around £200 and maybe settle for 250-275. Incidentally I think your sign off quote "Kings and Queens etc " is afflicted with some floating possessive apostrophes!
 
I bought an AX3 that had spent 5 years unused in a locker for £250, the problem I had after about a year the glue that holds the transom on failed. I did repair it with two part glue.
 
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