Thanks that's pretty useful in terms of what saves weight. The alternative is to forget the ebike upgrade and spend the extra to make it as light as possible. And get into better shape. I talked to a bike store here. If i have them import the parts and install for me it would cost about $1.5k per bike if include a Ti fork and triangle.

Could you suggest a good source for Brompton parts? Should I just source from ebay?

Thanks