I fitted new cables and a new lever assembly and the fresh air vents now open and close as they should. In the end I opted for a twin lever assembly so that each vent can be controlled independently although I am not sure there's much benefit to that. It was quite inexpensive off eBay and was a BL part for the MG1100. A similar one is available for the Austin 1100. I hope to get proper knobs at some point but for now the levers have rubber vacuum caps fitted as knobs. The whole assembly is quite unobtrusive below the dashboard.
David
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