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.
Isle Of Barra
Barra is an island in the Outer Hebrides, Scotland, as well as the second southernmost occupied island there, after the surrounding island of Vatersay to which it is attached by a short causeway. The island is called for Saint Finbarr of Cork. In 2011, the population was 1,174. Gaelic is commonly spoken, as well as at the 2011 Census, there were 761 Gaelic speakers (62% of the population). The Isle of Barra is roughly 60 km2 (23 sq mi) in location, 11 miles (18 kilometres) long and also 6 miles (10 km) wide. A single-track roadway, the A888, runs around the shore of the southerly part of the island following the flattest land and offering the many seaside settlements. The interior of the island here is hilly and unoccupied. The west and north of the island has white sandy beaches consisting of sand developed from marine shells adjacent the grassed machair, while the south east side has countless rough inlets. To the north a sandy pensinsula runs to the beach airport as well as Eoligarry.