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.
Highbridge
Highbridge is a small, previous market town located on the edge of the Somerset Levels near the mouth of the River Brue. It remains in the Region of Somerset, and is roughly 20 miles (32.2 km) north eastern of Taunton, the county town of Somerset. It is no longer a market town, the marketplace website is currently a housing estate. Highbridge remains in the Area of Sedgemoor, being situated roughly 7 miles (11.3 km) north of Bridgwater, the area's administrative centre. Highbridge carefully neighbours Burnham-on-Sea, creating part of the combined parish of Burnham-on-Sea as well as Highbridge and shares a town council with the resort community. In the 2001 census the population was 5,986. In the 2011 census the population of the town was included in the ward of Highbridge and also Burnham Marine, which completed 7,555.