About the mounting brackets (light not included):
The mounting bracket is the same for the light as the one used for the reflector. So if you are just replacing the reflector with the light, you don't need a new bracket (unless you want a more shiny one!)
If you don't have a rack - then you will need this "No rack" bracket. you should only need this bracked if:
a/ You have lost the bracket (which involves removing the brake caliper)
b/ You are removing your rack
c/ You have a bery old Brompton with the older style mount and wish to fit a current Brompton rear light / reflector
d/ something else? (answers on a postcard please)
Brompton Q part code: QVBKTRLAM-R-BK
Brompton part number: 9002900