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 Bees
St Bees is a coastal town, civil parish and also selecting ward in the Copeland area of Cumbria, England, on the Irish Sea. It was initially in the historic area of Cumberland. Within the church is St Bees Head which is the only Heritage Coastline in between Wales and also Scotland which is a Site of Special Scientific Interest. It is an RSPB reserve and also has the biggest seabird swarm in north-west England. St Bees Lighthouse stands on the North Head which is one of the most westerly factor of Northern England. St Bees is a popular vacation destination due to the coastline as well as closeness to the Western Lake District. In the town there is the Norman St Bees Abbey, and St Bees School established in 1583. The Wainwright Coast to Coast Walk starts from the north end of St Bees Bay. The town is served by the Cumbrian Coast Railway.