This bracket is on sale at Brompton UK for 50% off at £6.50.
If anyone is wondering if it works with the Ampp lights. Yes it does and doesn't come close to interfering with a bag on the front if you use one in the carrier block.
The Ampp 900 light was £20 off from Halfords for £45 which is pretty good considering its all metal body construction.
by Wondering_Electron