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@benbrangwyn
I'd like to warn everyone off the Rear Moon Gem 2.0. It's not actually a rear light. It's a front light which someone has tried to repurpose as a rear light by making the light red rather than white. And that's bullshit.
The key design difference between rear and front lights is that latter attaches to vertical members while the former attaches to horizontal. That means if you have a front light that's visible from the side, when you stick a red LED in it and put it on the back, the side viewability is completely lost. Also, it attaches to the seat pin in a way that ensures your thighs will make it swivel so that it no longer points in the direction of the cars that are following you.
I got mine from Parkers of Bolton, and sent it back with a rather scathing email that made them change the description on their website.
In the end I settled for a Moon Gem 3.0, which isn't as bright, but IS a rear light, is highly visible from lots of angles and is very convenient with its USB rechargeability.
Bottom line: stay away from the Moon Gem 2.0.