I've flown into St Mawgan quite a few times in the last year, and always find the staff very helpful - in fact we landed in the rain last time, and one of the ground support guys came and picked us up in his van <g>
Be aware it is staffed by Military controllers, so the terminology is slightly different on occasions - I'd never been asked for 3 greens before on a C150!! But saying that, they are the most helpful ATC unit i've flown with, even to the extent of passing the crosswind factor on landing.
They are very keen for prior notice, and weekend flights have to be PPR by 1830 on a Friday. Always worth checking before hand of any Mil Exercises...Harriers, Hawks, Hercs and P3s are a speciality.
Bodmin can get quite boggy, but we got a PA28 with 2 largeish guys out yesterday...admittedly 25 knot headwind.