Recently on hotdeals for £1 (pack of 4). went to wolverhampton store this morning and purchased 2 packets (of 4) for a £1 each = £2.
However they still had the original 2 for 4 on purchasing them at checkout and therefore givivng me a pound of the 2 packs
Therefore 2 packs for a £1
Update 26th July: They are Reduced from £3 to £1 for One pack (4 Burgers). Can confirm that you no longer get Two packs for £1.