In reply to Quarrymon:
I've flown from the top of Cloggy and from the Eastern side of Snowdon quite a few times, the best being in Summer when thermals were 'working', rather than in more dynamic weather system wind. Although Edel made a very lightweight mountain canopy some years ago, a canopy and harness are a bit bulky. Considering that there's not much on Cloggy below VS that's worth the walk, you'd be climbing VS+ with a very bulky sack and full rack (I presume) - not really huge fun on belays etc.
A good scramble like Parsons Nose or Cneifon Arete etc would give more giggles.
Fly in low in mountain areas, is full of hazards with the slopes heating in a very non-uniform way and venturi effects in valleys etc. Luck and a crystal ball are very useful in avoiding rough air in these areas