Does the UK have multiple automotive-aftermarket stores like the states? Perhaps the MOT doesn't want anyone but the dealers selling parts

Silly question, Jimmy, but have you checked with the next closest local jeep dealer? The "closest" went bust for most of us, too, but there are a few left out there... At the least, you may be able to get the part numbers and (potentially) order them for less elsewhere. I'm guessing the UK dealers probably ALSO perform highway robbery on seemingly inexpensive parts like this.
Dan
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2005 Silver CRD Limited

245/75R16 GoodYear Duratracs
Fumoto drain | ProVent CCV Filter
Stanadyne FM100 filter | Cummins fuel pump
GDE Eco | SEGR | BoulderBars | FrankenLift | Frankenskids