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I think this would work, however I don' want to smash £90 on it:
http://www.jejamescycles.co.uk/giant-tcr-seat-mast-id57755.html
I will pop in Condor and see if they can source a Deda 'teardrop' long ISP clamp.
Vince
TvH
https://www.bike24.com/p257708.html
this one may be longer, although I don't know the diameter you need.