Mountain wave. Note the stationary nature of some of the clouds.
Stratocu sheets are often the cloud types that give glider pilots the
best wave conditions in Britain. "Classic" lenticulars frequently
disappoint pilots.
The midday Camborne sounding shows a very strong inversion at around
920 mbs, one of the most significant factors:
http://weather.uwyo.edu/cgi-bin/soun...512&STNM=03808
Jack