Stay away from that garage. Utter BS as noted.
Ask in the UK regional forum for a shop recommendation:
http://www.e90post.com/forums/forumdisplay.php?f=22
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2024 BMW M3 Sedan Frozen Pure Grey II/Fjord Blue, 6MT
Past: 2021 Z4 M40i Frozen Grey II/Black Alcantara | 2017 F30 340i Mineral Gray/Coral Red, 6MT | 2011 E92 335i Le Mans Blue/Black, 6MT