Which might be just possibly be an antipodean pronunciation of Derek or with apologies to anyone from that fine part of the world, maybe not.
Either way she's a fine looking craft for sailing around the waters of Chichester harbour, shoal draft for getting into the shallow areas, with a well protected rudder in case of running into the shallows with a little too much enthusiasm and the ability to hang up some large foresails from the bowsprit.
I thought she might be a Heard 23, but the dead rise at the transom looks much flatter here. Any thoughts?