Arrggghhh ... didn't even think about this until just now. We were in New York City for ten days mid-late August. I even asked a couple of bike shops as we travelled NYC ... Capital DOH!!!

No - I have not tried the 650B tyre ... but will see if a bike shop here has any.
In the meantime, can you confirm that you have a couple of the 700D tyres at your home please.