i drive past truro airfield most days, theres the odd chopper doing scenic flights and some small fixed wings, however the road access is truely awful !
i would very much doubt that it would be an option to be honest with you.
however the more that i think about it the Hayle option sounds quite good, walking distance from the railway station, small terminal building, fire facilities and a hard standing/helipad. fly the choppers in first thing and then back to nqy every night for MX/basing
cs