Hi Jam,
The TK Bedford, had a double passenger seat, so you could change the single without too much trouble. Only difference in cabs between a TK and a MK/MJ is that a large panel between the seats can be removed to access top of engine, water pump, rad, etc on MK/MJ, not so on a TK, so remember this when fitting a bench seat.
As for having a tilt cab.......too much problems to convert, you have steering column, pedals, transfer box control levers, etc., would take a bit more than just fitting hinge pivots. With the aforementioned removable panel, removing a cylinder head is not too bad a job. We managed for years on these Bedfords without tilting cabs :-D