CL in Devon & Cornwall with the following

Have you tried searching rather than posting a vague question?

Yes but thought I would ask as well 

There is this excellent resource developed by members on CT:

https://www.google.com/maps/d/viewer?mid=17Ig4IykjXaE6lRoLLMJ1ek8ebz0&hl=en_US

There is a thread on CT that expands the discussion. It's a 30 second job to input the terms 'Serviced CL Locations' into the search tool, that brings up this:

http://www.caravanclub.co.uk/community/discussions/sites-touring/certificated-locations/I-Need-a-list-of-CLs-with-serviced-pitches/rt/324631/?p=21#index5

Hope you find what you seek, they are there  We grockles and emmetts have to assist each other when venturing beyond our yokel area 

Flo - have a look at Reen  Cross near Perranporth. Likely to be busy in main holiday period but convenient for north Cornwall coast and might suit you.