I need a length of the trim that goes between the rear arch and the body work. Checked on CBS online and can't see it, its not standard P trim.

Is something like this what you're after:

https://www.woolies-trim.co.uk/product/1793/rubber-extrusion

Pipeing

Tadpole trim.

As said tadpole trim

The one I used is called "Wing Piping"

https://www.carbuildersolutions.com/uk/wing-piping-14mm-tail-per-metre

[Edited on 4/2/18 by voucht]

Thanks all