Removed the Lower Tray (Clamping Frame Assy) and got all the bits of drain cup out, applied superglue and have a working frame around/into which I will attempt to pour Araldite* to make a more permanent sealing fitting, then more sealant to stick it onto the tray, then reseal the outside of the roof, replace the Lower Tray, then - just maybe - I might have a dry-inside Disco (after I've done the same to the front, of course
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TBH, I've been using the instructions in the Oct/Nov/Dec 2010 LRO Workshop section and it has not been as difficult as I had convinced myself it would be.
I might soon be able to offer advice to others in a similar predicament
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*Any alternative suggestions to Araldite ?? - I don't had a great track record with the stuff ...