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.
Ty Croes
Ty Croes is a tiny negotiation two miles east of Rhosneigr, Anglesey, north Wales. It was, momentarily, the home of No. 144 Signals Unit RAF, an RAF Strike Command mobile radar reserve. It has a railway station on the North Wales Coast Line which runs between Holyhead as well as Crewe. Ty Croes is residence to Anglesey Circuit that holds events at both club as well as national level. The circuit was extended in 2006 and is used by a number of groups for testing both autos and also motorbikes. One advantage of the circuit is its relative remoteness (from London) which permits testing to be done without bring in way too much attention.