Ouch, I hadn't realised that Peter!! The auction site I thought about selling my last classic on was this one and they charge the seller 5% which I think is reasonable. https://themarket.co.uk/

I agree, another £600 on top of the final price, plus a new set of tyres (£200) and that front brake pipe, so you are £1k down before you have even started looking for jobs to tidy up....

The price would have to be pretty good but you never know!