blue where can I find colour codes for paint purchase

You should have a white sticker on the wheel arch on either side of front doors, with the doors open. Also you will have the Vin No and other info including the body colour code. You could try your local Toyota dealer. Some of them are agreeable when you say its for an import. Its a Toyota stock colour after all. Remember to give the year of manufacture.

The small  black stick on plate and not white with Alf's details is on the nearside door shut pillar just below the door catch