The bracket for my B&M front light was too short casting a nasty shadow from the front wheel.
My options from the B&M catalogue were to mount the light on the handlebar or to get a marginal increase in height from their other brackets.
Neither were ideal so with som digging I tracked down this SON item which is going to do the trick nicely.
I may yet make further tweaks to the positioning so the wiring is temporary
Before
After
SON Part number reference