I pay national insurance for the national healthcare, has nothing to do with Apple's prices. Not sure if the 20% tax goes on the entitlement system as I have to pay for that with my income tax every pay cheque.
I also pay into social security and medicaid and medicare with every pay check, and guess what? I still have to pay for my own health insurance (my job does not pay for all of it). I am just pointing out the difference is your 20% VAT goes to the government to supply you with a service, where mine goes to a company to take a share of the profit to supply me the service.