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.
Fishguard
Fishguard is a seaside community in Pembrokeshire, Wales, with a population of 3,419 in 2011; the neighborhood of Fishguard as well as Goodwick had a population of 5,407. Modern Fishguard includes 2 parts, Lower Fishguard as well as the "Main Town". Fishguard and Goodwick are twin towns with a joint Community Council. Lower Fishguard is believed to be the site of the initial community from which modern-day Fishguard has actually expanded. It remains in a deep valley where the River Gwaun meets the sea, for this reason the Welsh name for Fishguard. It is a regular fishing village with a brief tidal quay. The settlement stretches along the north slope of the valley. The major town includes the parish church, the High Street and a lot of the contemporary development, and also exists upon capital to the south of Lower Fishguard, to which it is joined by a steep and winding road. The part of the community that deals with Goodwick grew in the first decade of the 20th century with the advancement of Fishguard Harbour.