In reply to johnrc: Cheers for that. I will need to look somewhere else as I am again running out of options after spending a fruitless afternoon in Snow and Rock in Bristol.
The following have now been officially dismissed as options:
RAB Latok - passable fit at waist and passable gaiter arrangement, but FAR too short.
Mountain Hardware Drystein - appalling gaiter arrangement and poor baggy fit.
Berghuas Vernal - loose at waist, baggy and another equally appalling gaiter design.
The only option I have investigated and haven't discounted is the Arc'teryx Theta SV. However, I've now had an email back from their head office confirming that no-one in the UK stocks XS Tall but retailers can special order it from the US. There is also the minor problem I can't actually afford them.