Great info on these unusual tractors over here.

I have a question. Although it is not a 744/745 I thought it would be alright here as it is Perkins powered. This 201 pictured I think is a tractor in England but do not know any history on it. Do you have any info on this tractor John? I have a friend with another 201 that has an odd serial number, engine mounts that have been added for different engine, and the big thing is the fuel tank has been made with extra fittings for a fuel return. All these features I assume point to it having a diesel engine fitted originally. Also what ever it was it is the first one made!