Digital signals cannot be increased in power until analogue television services are switched off as unacceptable levels of interference would otherwise occur. The digital signal will be improved over the next four years as digital switchover takes place on a region-by-region basis across the UK, completing in 2012. The process commenced in the Border region where the first switchover has already occurred at Whitehaven in Cumbria. The Middlesbrough, South and East Cleveland constituency is in the Tyne-Tees region which is planned to switch in 2012 along with London, the south of England and Northern Ireland.