It's also worth remembering the rules regarding the provision of LARS (sometimes they just can't offer a service because the poor bu**ers are simply too busy/short staffed etc etc) and also that Farnborough gets a special mention in
ENR 1.6.3
Advice to Pilots
5.1 The provision of LARS is at the discretion of the controllers concerned because they may be fully engaged in their primary tasks. Therefore, occasionally, the service may not be available.
5.2 While every effort will be made to ensure safe separation for pilots complying with RAS procedures, since compliance is not compulsory, some aircraft may not be known to controllers. Pilots should therefore keep a careful look-out at all times.
5.2.1
Farnborough and Boscombe Down Service Limitations
5.2.1.1 Due to periodic traffic congestion and high ATC workload, only a limited radar service (ENR 1-6-1-1, paragraph 2) may be available from the following ATS Units:
(a) Farnborough. Limited R'S - At all altitudes/Flight Levels. Aircraft inbound to Farnborough should contact Farnborough Approach on 134.350 MHz. On weekdays (excluding PHs) LARS/MATZ service is not normally available on 125.250 MHz after 2000 hrs (one hour earlier in summer). Traffic inbound to Odiham should contact Odiham Approach on 131.300 MHz;
Hope that helps.
Regards,
Big Hilly