I fear you may get some pelters for asking the question
Chrono 24 I believe charges 6% commission fee. if you were to price 10% below the lowest uk based on Chrono 24 for each model you’d probably be in the reasonable bargain territory with a chance of selling quicker through here than Chrono 24. Obviously if all the bargains are from abroad on Chrono 24 then remember to add back on a percentage for the importation costs that the buyer would have to pay.
Just spotted you’ve bought off people from this site and re-selling. In this instance speak to original buyer first if you are intending to sell for higher ( that to me is a fair thing to do )