Steve:
If you google "half the tax cuts go to the richest five percent" you'll get lots of backup for that, Nigel, including from the Resolution Foundation. Go for it!
As suggested I googled that, complete with quote marks, and got no hits.

I also tried it without the quotes and got the Guardian where, after using a version of the above headline they immediately corrected themselves, saying: Almost half of the personal tax cuts in the mini-budget will go to the richest 5% of the population, according to analysis by leading economic thinktanks.

Fortunately I don't rely on people quoting headlines, but read a little further.