Hi mate it is a TD December 1949 first moth of production of the TD's it is number 291 . You can tell the difference a TD has a front and rear bumper bar also the TD has the steel 16 inch wider wheels to fit radial tyres the earler TC had 19 inch wire spoke wheels very narrow usually with cross ply tyres. Rack an pinion steering was first introduced on the TD.
The TF came after the TD and the best way to pick it is the TF has the headlights molded into the bonnet rather than a seperate light as on TC's and TD,s
Charlie