The exclusion on iPads and iPhones is an EU mandate, but even then it isn't a "you must charge for this." They simply have to offer without for those that want it. Adding a tick box to get a charger included for the same price would be compliant, and only those that would use it would get one.That must be a UK thing. Here in Canada it comes with the AC adapter (both the 256 and 512 GB models).
EDIT:
Confirmed. It's a UK thing. The specs are different in the UK and France, and in both countries they exclude the power adapter. However, the adapter is there both in the US and Canada.
I wasn't aware that mandate extended to computers and even if it did, they are removing chargers and expecting people living in a country that voted to leave the EU to pay for them while customers in other countries continue to receive them whether they want them or not. Devices like this Macbook could well be bought as gifts by parents who don't know the charger isn't included. Teenagers don't have collections they can just reuse.