Plastering will fix small cracks in walls. Very small cracks may be fixed by simply reskimming plaster. More serious cracks will usually mean that you need to use new plasterboard or backing plaster. Larger jobs or deep cracks may need an experienced plasterer to come in.
Caersws
Caersws is a town and also area on the River Severn, in the Welsh region of Powys (Montgomeryshire) 5 miles (8 km) west of Newtown, and halfway between Aberystwyth and also Shrewsbury. It has a station on the Cambrian Line from Aberystwyth to Shrewsbury. At the 2001 census it had a population of 1,526, raising somewhat to 1,586 at the 2011 Demographics. In modern-day Welsh, Caersws literally suggests "Fort Kiss", although sws probably originates from a few other source. It has actually been argued that the website might preserve a Roman-era dedication to Zeus or preserve the name of a conjectured British queen Swswen.