Wow. I didn't know how strict the UK legislation is in this matter. I once photocopied an entire book in London. Guess I am a criminal now.

The UK is far stricter that other countries with "fair dealing".

Also, while what you did was possibly illegal you're not a criminal. People could sue you for loss of earnings, but the police (and fines and criminal records) only get involved if you are selling what you're copying.