Hi Foz2,
Not sure of the exact figures but here goes:
Filton
I landed there in a Beagle Pup and stayed for around ten minutes back on the 17th December 2003. This was an unforseen circumstance (passenger decided that he should have used the bathroom facilities before departure whilst over the new Severn Bridge).
We were charged just over £17 if I remember correctly for this visit.
Exeter
Even more sketchy information but for a Piper Warrior, ILS R26, Landing and parking for around 30 minutes came to something like £18 back in January this year but I recall this from a very bad memory! I'm not sure if they actually charged me for the ILS though.
Best wishes,
Charlie Zulu.