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Do we have any information on the date when the horn located under the seat was relocated to the more commonly seen front mounted location
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Its in the DME circulars under the medium "When Necessary" section
B.390 20/1/43 Horn - Revised design & location. B.S.A. M/C.
Presumably alterations to existing machines would have happened at roughly the same time as changes in the factory.
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Its one of very few which I have seen copies off, wish I could find more. And interestingly it seems to show a drawing of a WB30.
It seems then that up to 1942 the horn was under the seat
Yes it looks like a wb30 engine plate but the horn bracket shown in the illustration appears to be a different type too to that of an m20