Outfit: Bailey Pursuit 430 Mitsubishi ASX4
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Some years ago I had a right set too with Vauxhall Vectra over removable Towbars. The handbook had 2 pages on attaching and removing it, but Vauxhall claimed they did not supply one for it.
After a long letter from head office it turned out the handbook was translated from German, and while the particular towbar was a standard fitting in Germany it did not have type approval in the UK.
It would seem that you must have a UK type approved towbar, and remember they are subject to MOT scrutiny these days.