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 Davids
The city of St David's is the smallest city in Britain with a very small population of simply just 2,000. This is significantly less than most towns in Britain too. St David's features a lot of historical importance and was the very last resting place of St David, providing its name. The cathedral and 14th century tower gate are types of the city's dated architecture. St David's coastline forms a piece of the Pembrokeshire Coast National Park too, which is a very popular tourist destination.