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I think it must be - the businesses in Part 3 Schedule 2 are those that are allowed to remain open, as they are deemed "essential".
As a result, 6(2)a permits you to leave your house to visit those businesses.
It wouldn't be much use if you allowed Bargain Booze to remain open, but then also made it unclear if leaving your house to go to Bargain Booze could be deemed illegal, as it's not "necessary".
The whole of article 6 really is a dogs dinner - it reads like you can only visit them to get money...
Scrabble-
The problem is the use of the word 'including' in the phrase 'including from any business listed in Part 3 of Schedule 2' - including what? Does it mean that you're allowed to travel to get things from those businesses, as long as they're the basic necessities or money identified earlier in the paragraph (in which case why are the words 'including from any business listed in Part 3 of Schedule 2' because everywhere else is going to be closed) or does it mean that you can travel outside your home to buy anything which one of the businesses listed in Part 3 of Schedule 2 is selling, which would mean that you're permitting non-essential travel.
It really is painfully badly written.
Brommers
The SI is incredibly poorly drafted. I've been trying to work out what the words "including from any business listed in Part 3 of Schedule 2" are supposed to mean, and whether they're supposed to mean that any travel to and from "any business listed in Part 3 of Schedule 2" is permitted. Still not sure what they're supposed to mean.