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.
Mitcham is the south west region of London, in the Borough of Merton and has now a population of almost 50,000. Nearby districts consist of Wimbledon, Streatham, Tooting and Morden. The area is known due to the great open spaces, which includes many large ponds. If you're thinking about any home upgrades within the Mitcham area, be sure to only make use of vetted companies in the region to ensure a great price in addition to high quality finish.