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.
Llanarth
Llanarth (population 1,616) is a tiny town as well as neighborhood in Ceredigion, Wales, situated on the A487 in between Aberystwyth and Cardigan within three miles of both Aberaeron as well as New Quay. Llanarth has a petrol station, post office, a primary school, a public house, a butcher, a Spar corner store as well as a yard centre. The parish church of St David's, when dedicated to St Fylltyg, is a Grade II listed building. It was refurbished in 1872. A rock in the churchyard is often mentioned as bearing the Devil's footprint. According to tale, he was attempting to take one of the church's bells one night, however woke the vicar, that drove him off. He left the footprint as he left.