Rightho - as a student pilot I'm sure you'll know that for any such info, you can look in the AIP (Aeronautical Information Publication, sometimes called the 'air pilot'). go to
www.ais.org.uk
and register (v quick and free). Once in, select publications, aip, aerodromes specific, peterborough sibson
That will answer your questions. If not, just call the club - you know they will help, there's no need to post with these things on here...
NSOF (Northamptonshire School of Flying to give it the full title) still exists - NSF Sibson is just the Sibson bit of it ('NSF' as giving it the full title would seem a bit odd, given the fact the airfield is in Cambridgeshire...)
PS It's 'Facilities', 'has become' - couldn't resist sorry