Things that are different between a GT and a clubman (probably shorter writing what is the same
)GT
*1275 Motor (9f, 1200/XXX, 1205/XXX,1206/XXX. From memory yours should be 1200) (one sold on ebay a few months ago
)* Close ratio gearbox (cant remember the specified code atm stamped into front of box)
* Oil cooler and bracket and hoses
* Dizzy
* twin carbs
* hydro bags
* disc brakes
* hardi-spicer joints
* electric fuel pump
* r/h tank
* centre grill badge red Not blue
* flairs (same as late model Leyland mini ones)
* basket weave seats OR similar seats to normal clubman but sewn differently
* triple clock cluster (6.5k redline and 120mph/200kmh limit)
* boot board brackets and boot board
* wheels (similar style to late clubman, but 2 holes per corner not 1)
* boot and grill badge
* Rear has spacered hubs
Things that are same......
* carpet
* colours
* subframes (hydrolastic- bags diff though)
* seatframes
* roof lining
* dash pads, switch panel, radio dash linings and heater
* steering wheel, rack, column and shround, ignition
* wiper motor
* All lights and handles
* bumpers
*
That's about all I can think of just sitting here