you need new holders and pads, the brompton 1 piece pads are 1 piece so have no inserts. The old / current brompton pads with holders/inserts, take the BXP inserts no problem
I recently scored some Ultegra pads/ holders for my Brompton - heavily discounted from Chain Reaction - hopefully the bolts on these won't rust as quickly as the original Brompton ones did.
you need new holders and pads, the brompton 1 piece pads are 1 piece so have no inserts. The old / current brompton pads with holders/inserts, take the BXP inserts no problem