Please report dangerous drivers to the police - Roadsafe. Report to plod, not just whinge here.

As ever in this thread, I didn't notice the number plate due to forgetting to notice it.

It's worth actually training yourself to notice/remember numbers as the first reaction. It takes a little practice, but any time anyone gives a slightly too close pass, or even just randomly, try to focus on the number and remember it as quickly as you can. The more you do it the easier it becomes. Hopefully when you need it the next time you'll be able to. That said, jumping out of the way of a trailer is enough to give you other things to think about...
Glad you're ok