Received a 'promo' email from Swytch with details of their products relating to Brompton Cycles.. the list contained a battery 'bracket' that replaces the 'bag bracket' on the headstock ... this means the battery is re-located from the handlebars to the headstock. Whow !! what a difference.. the weight is moved from the high up position that impacts the steering function... to way down low .. lowering the centre of gravity. Back to normal bike handling... this is a great improvement. ( had to remove the front light reflector ... no probs .. battery pack has a light built in... no Brompton bag .. I use a light weight rucksack .. all good !! )