Little discovery I've made, which some will already probably know about, is Landrover heating duct hose.
So this is really aimed at those who don't and are looking for some suitable ducting hose.
Readily available and a perfect fit for Moggy heater vents.
It also seems to reinforced with a kind of flexible white resin (picture below), rather than wire (which rusts and snaps) like the original. Be warned though, it is a very snug fit, which while it is what we want, may require some perseverance (as I found) to get over the nozzles on the vents / the heater hose directional splitter.
It is supplied in two lengths, of which the shorter one is ample to do one car, so you can do at least two Morris Minors with one kit!

Link below for anyone interested.
Best wishes,
Mike.
https://www.ebay.co.uk/itm/Land-Rover-S ... 2749.l2649