Re the Airnimal folding, I saw an article quoted here just a week or so ago, can't remember where, but I read it and was very impressed by the folding performance going by the review which had some pics. It was a Londoner who was unimpressed by the likes of Brompton (he called it a dog), and speed and train issues were important to him, as they are apparently to you. He tried a Joey and bought one after just 1 test ride.

I hope someone can supply the linky...?