Lynx deodrant 2 for £4 is a deal within itself as it is normally £2.50 per can. I took the Lynx 3 box set (2 cans in a box, both can be used as a regular spray although they can also be used together to create a different scent) which is on the shelf at £4.99 and it scanned through as part of the 2 for £4 offer.
General 2 for £4 deal is online as well although i cant see the lynx 3 included on there.
I was asked to buy one specifically for my nephew as well so i bought the lynx 3 for myself and one other although you could technically buy 2 of the lynx 3 sets and get 4 cans of deodrant for £4 (which would normally cost in approx £10)
Receipt and images as below