Farnborough has access to several different radar heads in order to service East and North sectors;the 'main' head for north is situated at Stansted but due to maintenance, this was supplanted by the Debden radar which is really designed for en-route rather than terminal tasks; Heathrow radar heads are also available.
North sector was open from 1000 - 1600 on friday and 1000 to 1700 today.