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.
Rogart
Rogart is a little village in Sutherland, Highland, Scotland. The town was the home of Major Andrew MacDonald, who dealt with in the French and Indian War. It was initially a scattered crofting town, till the opening of the Rogart railway station at Pittentrail 1 1/2 miles (2.4 kilometres) to the southeast. A more recent industrial town grew after the arrival of the train in 1886, with the older village staying. The village of Golspie is 9 miles (14 kilometres) eastern of Rogart.