Don't forget the donkeys...
The Blackburn Cirrus Major and Minor engines live on today in a variety of Austers, Miles etc.
They are excellent engines that seem to have gained an unfair reputation for poor reliability. Spares are an increasing problem because the series were not progressively developed in the same way as the more numerous DH donks.
Poor reliability is invariably caused by running poorly maintained & sh@gged out engines.
On the plus side - If you find an Auster for sale with a Cirrus engine, it is likely to be a lot cheaper than a Pikey-Powered equivalent.
HP