Earlier quoted context omitted.
I found it weird to realise CPAP machines requires prescriptions some places. In the UK you can just order one next delivery from Amazon.
CPAP machines require a prescription in the UK. https://www.hope2sleep.co.uk/cpap-machines-sleep-apnoea.html Amazon is breaking the law by shipping one to you. I suspect there is very little enforcement of this law, which is why Amazon is unknowingly breaking it.
Which law is it you think Amazon would be breaking?
EDIT: In fact the page you linked itself points out that the "prescription" they are talking about is in fact not a prescription. "When the word 'prescription' is used for the purchase or rental of a CPAP machine, this is not like a standard prescription which GP's provide for medication."