Wanted: Tiny frame/bike for midget/umpalumpa other half

You definitly want something with a slopping top tube IMHO. Something with geometry like a Giant Bowery for example.
You might get 1cm standover on a XS, which has a effective top tube length (most important measurement) of 51.2cm.
http://www.giant-bicycles.com/en-US/bikes/lifestyle/2344/32159/

Thanks for the heads up, but have been trying to check out a giant bowery and it's impossible - they also don't stock the XS in the UK :( see above post - you have to commit to buying the bowery/chixie before seeing or testing them first. basturds.