[cypher]

I would just stick with toilet paper, no idea what the wilko paper is but kitchen paper doesn't break down like toilet tissue so not as safe.
Sometimes it's hard to know why they bite when they're new & young, when you offer treats keep your hand flat & still & try leaving a trail of seeds from your finger tips to your palm so he can find food as soon as he smells it & doesn't bite just expecting the treat he can smell.
Another way is to bury your finger tips in the substrate & put a treat on your palm.