Chris, Condor Farm in my opinion is the better of the 3 sites. No advance bookings though, just turn up on the day. £4 Per nite and a massive breakfast in the farm house served between 8.30am & 10.am for a further £4 (smaller versions also available) and as many cups of tea to go wi it.

As for Whitby no won't be there, but will call in there sometime when when the Robin Hood's Bay bash is on (june 10 -12th).
Cheers

Muppett