ISTR there was an NDB at Brill, though not sure why?
'WCO' its still there, being part of Heathrow arrivals into Bovingdon stack Luton and Stansted arrivals too.
http://www.ead.eurocontrol.int/eadba...2010-07-29.pdf
The area was also one of those under consideration for the 'third' London airport with Cublington being lead candidate for a while
aylesbury - Google Maps