In store at Sainsburys these are half price - 9 chunky bars for £1.12, which works out at under 13p for a 50g bar.
The website shows these as £2.24 - so not an on line offer
Thanks to Bougainvillea on MSE for the spot
A insert was put in the MSE post
Thanks to Bouganvillea for this find. So to confirm Sainsburys are now selling Kit Kat Chunky 9 packs for half price at £1.12 in Sainsburys locals stores only, and the offer ends Tues 6 July.