I saw some promotional stocks in Asda today.
Key points to note are that the cashback offer is only valid from Scottish stores and you have to buy a promotional pack and not just any old pack
For the moment the 500g pack is £3 in Asda, so buying just one block of this can effectively save you £2 off your next £7 of groceries
From the T&Cs:
"£5 cashback when the customer spends a minimum of £10 on shopping (including a 350g or 500g promotional pack of Galloway Cheddar) in any store in Scotland (excluding alcohol, fuel, household goods and toiletries). Customer must upload image of receipt to http://www.gallowaycheddar.co.uk
and enter details to receive £5 cashback via post which will be paid within 28 days. Please note that over the Christmas period, we cannot guarantee delivery within 28 days.
Maximum of 3 entries per household, maximum of £5 cashback per entry."http://www.gallowaycheddar.co.uk/