David,
I've gone with a Mikalor 29 - 31 mm clamp (W2) tightened carefully. I don't think a cable tie would do much given the evident pressure generated.
Attachment Mikalor1.JPG not found
Hopefully I've not transferred the stress elsewhere. Not 100% happy with the vulcanising on one side of the joint although it has an inspection stamp and is probably (!) just surface pitting.
It will be some time before I can fit this.
Richard
1.8i Mk2 Solar Red, 16 inch square spoke wheels, MGFMania hood with zip-in glass rear window, DRLs, Kmaps ECU, Pipercross panel air filter, MGOC Supersports back box & some cockpit bling