Also after info regards sub stations and Power stations that actually supply my power.
There will be a number of sub stations involved, reducing from the 400KV super grid down to 415V three phase within your street. Your house will be fed from one of the three phases (240V between phase and neutral). Your power cuts will be as a result of a fault developing within one of these sub stations, probably the smaller local one in your area.
As for which power station your electricity comes from, really its impossible to say. The national grid transmission system covers the UK with all generators connected to the grid. Electricity is generated on-demand so say you switch your kettle on, the total demand goes up by 1 'kettles worth', all the generating Units selected to frequency response (mainly coal fired units as nuclear and gas turbine plant is very inflexible) see a slight increase in demand and generate a little bit more electricity to keep the system frequency at or around 50Hz. So your kettles worth of electricity might come from Longannet in Scotland (coal), Dinorwig in Wales (Hydro), Drax, Ferrybridge or Eggborough in Yorkshire (Coal), Ratcliffe where they are going to invade in October (coal), Tilbury near London (Coal) etc etc