There isn't any. I have 2 compressors, although one is in bits right now. I'm about 15-20 minutes from Padstow.
I do fill for locals and could make an exception. If you need nitrox/trimix I can get some Oxygen/Helium for you, I am a qualified blender.
Once my garage has been converted it will be a proper dive shop/school sort of thing nearly
Otherwise, Penryn is the next closest.
If it's any help I have done hundreds of dives out of Padstow/Rock, if you need help with selecting sites etc. just ask.