Lazarus, my 1952 TD, is Car No. TD10855.   Here in 'the States' this number is referred to as the VIN.  The number is stamped into the vehicle ID plate as shown here:


The Car No. is stamped into the left front frame extension in characters about 3/8" high.  If you're lucky, they're stamped just below the edge of the fender sheel metal.  They may be covered with layers of paint/rust/crud, etc.  Here is an image of Lazarus' stamping: