From time to time I fly northwards from Blackbushe towards Buckingham, VFR. Farnborough West LARS hand me over to Farnborough North LARS roughly when I'm abeam High Wycombe, but I've often found that I cannot raise Farnborough North until I'm around where this accident happened. Perhaps it is a coverage blackspot (at 2000-2500 feet). And on a sunny day, Farnborough LARS are usually too busy to offer me more than a Basic service.