Best rear light for cycling in winter?

[helpimcrap]

Hi all,
I used to have a knog blinder which was great but the strap kept breaking. I have a moon comet(?) now and it doesn't flash. I want a flashing one at that is much more visible to car drivers in these dreary days.

Can anyone recommend one please? I have a £50 voucher for Evans however I want to spend nowhere near that as I'd like to get some other bits too.

 

[helpimcrap]

Cheers all. Evans is the only choice as I have a voucher.

I don't want something so bright it blinds drivers as I've followed them on the London to Paris rides at night. Knog blinder was perfect compromise apart from crap strap.