Many thanks to all for responding.
I wish I had a photo as it may make things a bit clearer but unfortunately not.
The Me110 is a similar profile, but the cockpit on it is much longer and very square edged; it also has a gun position at the rear of the cockpit which accounts for the length. In addition to these points the air intakes for the oil coolers at the bottom of the nacelles are rectangular.
Both the Bristol Buckmaster and Brigand have radial engines and squarer cockpits so unless any were fitted with in-line engines and a modified cockpit they don't fit the profile but in other ways are very similar to the model.
The model has a shorter rounded cockpit, in-line engines and the air intakes for the oil coolers at the bottom of the nacelles are smooth crescent shaped.
Definitely not a gas turbine engined aircraft.
It is a pity that many manufacturers (and there have been a lot) produced aircraft with this type of profile - especially the twin finned tailplane - or it would be a simpler exercise to identify this one. Guess the only option is to keep looking. If I can get a photo of the model I will post it.
Thanks again for all your help.