Having ventilation in the roof void is a requirement for building regulations approval. Fitting ventilated soffits is the typical way that this roof ventilation is achieved. If you do not have roof ventilation, you may find that your roof void has problems with condensation or overheating.
Nelson is actually a town plus civil parish inside the Borough of Pendle in Lancashire, England, having a population of 28,998 in 2001. It can be found 4 miles (6.4 km) north of Burnley about the Leeds and Liverpool Canal.