Does Heathrow (or any of the London airports) still have an approach radar room on site, to act as a back-up in the event of an equipment failure at Swanwick ? If so, are there appropriately trained staff about to provide a radar service, given that the London airports are basically tower-only these days ?
I know Heathrow used to have Approach on the ground floor of the now deceased tower and that was supposedly retained after the move to LATCC.