From: Raggytash
Date: 23 Dec 17 - 06:49 AM
Makes you proud to be British doesn't it.
In the Guardian editorial comment it also mentions the 600 pound annual rise in living costs since the Brexit vote, and of course this hits the lowest paid hardest.
Living Costs Increase

What a shame you don't seem to have read the link before posting it. it does mention 600 pounds, but what it says is: On one estimate British households are each more than 600 pound a year worse off following the vote.
Following that further link (to their own site) what the page actually says is:
British households are each more than 600 pound a year worse off following the vote to leave the European Union, according to one of the UK's leading economic forecasting bodies.

The National Institute of Economic and Social Research (NIESR) said it is 'almost certain' the leave vote has damaged living standards and hit the growth potential of the economy. The thinktank also scaled back its expectations for growth in the UK for the next three years.

So the 'facts' are "almost certain", in their view.
By the Guardian posting them as 'facts', and hiding the uncertainty in the smaller print they allow others (in this case themselves) to later put the same figures out as if they are an accepted certainty, allowing more credulous people to then quote them in turn.