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Looking at pics, I see you have a lot more of the carrier! That extra oiling port connected I think to an elaborate thermostatic valve and a loop of finned cooling tubing.
Engine in general will be same as a USA '37 except for the oiling system and the possibility it may have locked rod bearings instead of full float. If it used USA distributor I think it would have been the 1933-36 type (never superseded over there), but it could also have had a Lucas. I think English carriers used a one-barrel carburetor with an adaptor to the two barrel manifold.