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.
Llanbedrgoch
Llanbedrgoch is a community and also post town, a mile south of the town of Benllech as well as west of Red Wharf Bay, on the island of Anglesey (Welsh: Ynys Môn), north Wales. The parish church is St Peter's Church, Llanbedrgoch, a Grade II listed structure that goes back to the 15th century. The historical settlements in the area have been subject of archaeological expedition. The town held the National Eisteddfod of Wales in 1999. Before the 2013 council political elections, Llanbedrgoch was a single councillor ward to the Isle of Anglesey County Council, though complying with The Isle of Anglesey (Electoral Arrangements) Order 2012 the ward was joined together into a brand-new multi-councillor ward, Lligwy.