Comment by alkonaut

There is only one way to respond to this. You just do not comply with this. If you are Apple you withdraw from the UK completely if necessary. But a better option is probably to just take the punishment for not complying while you appeal. The cost will be large regardless. But the reputational damage if Apple complies seems it will be larger than both the fine for noncompliance or the cost of losing all business in a large market like the UK.

I think Apple has a very short window for a powerful response here. It should be re-using the famous Pirate Bay wording for maximum effect.