Wait, what? Who pays VAT? Who pays tax on wages and salaries?
Are you being deliberately obtuse? There is a 20% tax on turnover on EVERYTHING Apple sells in the UK. It's called VAT. And they have Apple Stores and other back off office staff, so they employ lots of staff in the UK, all subject to national insurance and so on. So Apple's UK operations pay UK tax. And the profit goes back to where the parent company is registered subject to US corporation tax.