hi
no open fires i'm afraid but if you can get to llangollen easily enough you can take the steam train to carrog station where there is a campsite on the banks of the river dee.
another one i like is just off the a55 past conwy so should be on a bus/train route. its at penmaenmawr/dwygyfychi and is called woodlands. again no open fires but a beach and some lovely snowdownia countryside around.
try here for some more ideas. it tells you whether open fires are allowed etc:
UKCampsite.co.uk - Caravan Sites, Parks and Camping Sites in England, Scotland, Wales, Ireland and Europe
good luck
tim