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.
St Asaph
St Asaph is a Welsh city based in the northeast of the country and it has a populace of just 3,000. It was constructed around the River Elwy and it's the second smallest Welsh city, slightly in front of St David's. St Asaph only acquired city reputation in 2012 within Queen Elizabeth's Diamond Jubilee celebrations after becoming previously demoted. If you wish to make the most out of your home in St Asaph, make sure to make use of the top rated tradesmen in the area and get a top quality job finished