Diver Guide, Dive South Cornwall by Richard Larn. Sheltered from westerly bad weather. Shallow enough for newly qualified divers. Still worth a rummage under the plates. Some spectacular marine life on the rocks.
Tides can be a problem.
Partic-ularly crowded on Easter weekend. If you want to drop a shot on the boilers, use the transits and an echo sounder to search about 50m out, just east of north-east from Maen Voes.