Possible result Alex (though won’t know for sure until go motorway cruising again.
Spare wheel was sat on one pipe and held tight that the tyre was squashing the other against the bulkhead.
Have moved the wheel into the boot a bit, so the lower pipe moved freely. I’ve jammed something between the tyre and bulkhead so that when wheel tightened into place it won’t squash the other pipe.
I’ll let you know later in the week when we travel home for the Dordogne if cured.