2004 ele parking brake not pulling up to m.o.t s type jaguar

I presume you mean the electronic parking brake does not meet the minimum effort for mot test, first check the rear calipers and pads, the caliper sliders seize and/or the pads seize in the caliper frame, check the discs also for bad corrosion, is the park brake warning showing on the dash? if so check the wiring above the rear subframe its prone to chaffing and grounding out, the park brake motors are also troublesome, sounds like a pad/ caliper problem more than likely seized sliders easy job to free off, hope this is helpfull to you.