Hi there!
Some fellows from Barcelona are manufacturing interesting accessories for your favourite bike, wether you want to pimp it up or you want to carry your child safely, with extremely quality parts and accessories.
I had the chance to ride the "Pere" with my 5 years-old nephew and it was just perfect. These guys are specialized in brompton since year 2000 so they know everything about it!
They also have a leather handlebar grips that matches perfect with a brown leather brooks and seatpillar in black with laser marks to lift it up to your desired length.
Check this out!
Monsk&Brompton