When you say the cymbals are Paiste, it is rather like saying that a car is a Ford; i.e. there are expensive Paiste ranges and cheap Paiste ranges. If you post the name of the Paiste range, what they are worth will be clearer. In the seemingly-unlikely event that they are professional-quality cymbals, they will be worth selling separately.
I would value a recently-manufactured Pearl export kit with budget-range cymbals, all in near-new condition, at about £200. I doubt that anyone would pay p&p for a budget kit like that, so you need to be thinking of a local sale. I would advise you to search for similar kits, on Ebay and elsewhere, and check their sale-prices to form your own impression.