Some articles on sidestrand mk, mk, sidestrand:
Boulton Paul Sidestrand - Operational History
... the first batch of six aircraft being the Sidestrand Mk II with ungeared Bristol Jupiter VI engines ... These were followed by nine of the Sidestrand Mk III variants with geared Jupiter VIII Fs, and the final three production aircraft were replacement Mk IIs ... The Sidestrand inherited the good manoeuvrability of the Boulton Paul P ...
... the first batch of six aircraft being the Sidestrand Mk II with ungeared Bristol Jupiter VI engines ... These were followed by nine of the Sidestrand Mk III variants with geared Jupiter VIII Fs, and the final three production aircraft were replacement Mk IIs ... The Sidestrand inherited the good manoeuvrability of the Boulton Paul P ...