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.
Rhayader
Rhayader is a market town, area and electoral ward in Radnorshire, Powys, central Wales. The community is just one of the primary centres of population in the historical area of Radnorshire as well as has a population of 2,088. 55% of the community have some kind of Welsh identity according to the 2011 census. It is the first town on the financial institutions of the River Wye, 20 miles (32 km) from its source on the Plynlimon range of the Cambrian Mountains. It is situated about midway between North and south Wales on the A470, 13 miles north of Builth Wells and also 30 miles east of Aberystwyth on the A44 - two of Wales' essential trunk roads.Rhayader and also its surrounding areas are supported by growth organisation Rhayader 2000 Ltd, established in 1996 to restore Rhayader's economic situation. Rhayader 2000 Ltd is a voluntary industry organisation standing for a sample of the neighborhood neighborhood. It constructs relate to Powys County Council, Rhayader Town Council, regional businesses as well as charitable as well as volunteer organisations.