Have just had the same problem but in Lincolnshire, eventually took her ourselves to VOSA in Peterborough and passed. Not as bad as we'd had nightmares about for nights before we went, they were really helpful and pleasant.
Have you tried Mercury rv at Sittingbourne? Simon there took our friends' rv through pre-MOT checks etc and presented it for the MOT for them. Can't speak personally but they were well pleased with his service.
Good luck and happy travelling
Jan
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