Anyone know what the black plastic part is called that fits at the rear of the sill just before the rear wheel arch.
I have a 2001 model and the N/S one is missing, probably a trip to the scrappy will prove fruitful but how are they fixed to the car?

You have answered your own question in the title, N/S sill 'rear plastic trim' if I remember correctly it is held on with one or two 10mm bolts, it comes with a shaped bit of plastic under the car itself.

I only paid a pound for one for my car

Ah, thought it might have some fancy name like deflector or something.

Will take a few sockets along to the scrappy at the weekend doubt i'll get it for a quid though.

you on about that mudguard type thing? with a triangle shape under the car?

If so i also need one lol

Yes it is a triangle shape must be the same thing. Hope you find one its not essential but looks better if its there.