Thanks, again, Patrick for your comments. I had suspected the image had been "borrowed" from Messrs. Fuller & Johnson. The logo is skewed and of a different design from what we usually see.
There were low tension Rosebery engines built, I am sure, but this isn't one.
How about a Brons Rosebery, do you have photos of one? I should say Buzacott, as we are in the B section at the moment.
Eric