How long do the cops / CPS have...

[gaz]

To do something after an collision? The number 6months pops into my head but i'm not sure if that is right or what is for.

Can someone please remember for me

 

[PpPete]

There's a limit of 6 months on the offence of "Careless Driving".... but not on "Dangerous Driving"

 

[classic33]

I think your right with six months, see
http://www.bikersoracle.com/vfr/forum/showthread.php?t=61208

You could always go via the IPCC, as is suggested in the link.