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.
Halkirk
Halkirk is a town on the River Thurso in Caithness, in the Highland council location of Scotland. From Halkirk the B874 roadway runs towards Thurso in the north as well as in the direction of Georgemas in the eastern. The town is within the parish of Halkirk, and also is stated by locals to be Scotland's first prepared town.