Been a busy boy and went and got this.

Went to a place that MacColl from off here knew about.
400 ml can of LP7Y mixed and fitted with a fancy nozzle £10.40 x 2.
450 ml can of black gloss £3.97 x 2.
500 ml con of clear laquer £3.67.
5 Litre can Tetrosyl underseal £12.85.
Total £45.28 not bad to paint a door that had o few "blemishes" on it.
I'll post a picture up if it is a success.
Fingers crossed.
Hope to have enough left over to touch up front O/S wing as it is looking a bit tatty.
A BIG THANKS TO ALL FOR YOUR REPLIES

A heart broken GLI - R.I.P. A loveable GT. A practical Polo now deceased.