Have my car booked in for mot on Friday morning, and my drivers side rear caliper, the bleed nipple has snapped. I had a spare and that snapped too

Not had much luck getting them out so need a caliper with working bleed nipple tomorrow. Long shot I know but does anyone have one in the corby area?
Can travel to you in the evening to collect.
Thanks
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Chris1999 China Gti6 Supercharged

2000 Bianca 306 Diesel [Work runabout]