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.
Clynderwen
Clynderwen is a country straight town and community, historically in Carmarthenshire in Wales, however administered as part of Pembrokeshire. It lies on the A478 Tenby to Cardigan road south of the town of Llandissilio and north of the community of Narberth. Clunderwen, translating into English as "oak thicket", is called after an estate of the exact same name. On 1 April 2003, the town was transferred from the management county of Carmarthenshire to that of Pembrokeshire, adhering to a border change between the areas. At the same time, a name adjustment to Clunderwen was proposed to reflect the actual use by the area council and also on road and also various other indicators.