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Good luck, one of those jobs you kind of don't want but do for the experience, whatever you do it is likely to be a bit of an adaption but at least the joint will be in the right direction of flow & the heat shrink should not crush the lead, as said before just don't like em rubber & jubilee joints.Thanks for that Chris, to be honest I thought there would be more products on the market for this and we'd find a host of things to try within minutes of my forst post, but it seems I was wrong.
If we get the job we could always refer that part to the lead expert that will be doing the hidden gutters and other lead work.
Thanks muchly for all the advice given here, again 'if' we get the job, photos and measurements will follow. 😉
done a few lead soil stuff but never downpipes, i am sure you can get a black rubber which fits in the lead but not sure if its as big as you need but you could allways use a flex seal which looks like this View attachment 15771