buying a new outboard

I paid £500 for my 4 stroke 5hp secondhand Mercury just 6 months old took it out on my rib tender up the river at Christchurch today perfect!
 
If someone were selling a 6hp mercury 4 stroke, exactly 1 year old, but literally used once only for about 20 mins, then stored in my warm garage, absolutely mint, still 1 year warranty left, all receipts etc, bort in UK, I would expect I would ask say 65% of new price. It's in Bucks BTW.
 
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