A number of readers who are knowledgeable about Rolls-Royce aero-engines have pointed out that, in my article about the Merlin-Royce, I quoted the Kestrel as a 37-litre engine whereas I should have referred to the Griffon. There were some slip-ups on picture captions last month; I do know that a DH Fox Moth does not resemble an Autogiro and what JCC and BARC badges look like!