You should pull up and remove weeds by hand as and when they appear. If it is a regular problem, you might need to reseal the paving. In extreme cases, the sub layer itself may need to be re-laid. You can use weed killer, however some paving can be discoloured by stronger weed killers.
Whitehaven
Whitehaven is a smallish town and port around the coast of Cumbria, England. Traditionally a part of Cumberland, it is equidistant in between Cumbria's two largest settlements, Carlisle and Barrow-in-Furness, and it is served by the Cumbrian Coast Line along with the A595 road. It is the administrative centre of the Borough of Copeland and an unparished area.