If you're out cycling at night make sure you can be seen.
You've probably notice some cyclists covered in lights, like a council house at Xmas.
So it worked! You noticed them!
Flashing lights work well because the human eye notices movement better than something constant.
But they're not great if there are no street lights as they don't light up your path.
Wearing reflective clothing will help, don't worry about how you look, just make sure you can be seen.
Try it this evening, just notice which cyclists stand out from the crowd and why, and then try to copy them.
Here's a link to a story about Bradley Wiggins getting knocked off his bike by a van. If it can happen to him.....
This is Rule 60 from the Highway Code so you know the legal requirements.
At night your cycle MUST have white front and red rear lights lit. It MUST also be fitted with a red rear reflector (and amber pedal reflectors, if manufactured after 1/10/85). White front reflectors and spoke reflectors will also help you to be seen. Flashing lights are permitted but it is recommended that cyclists who are riding in areas without street lighting use a steady front lamp.