Just had a thought regarding the B+Q "20% off everything when you spend £50.00" the critical word here is everything.
So I go to my local store and buy a selection of items worth £50.00, when I get to the checkout till and ask them how much cash they have, reluctantly they reply £1000.00,I say I'll buy all that and give them £800.00 for it ( 1000- 20%= 800!!!),pay for the items I bought and walk out with the items and £150.00 profit.
If Carlsberg made B+Qs!!!
I did once go to a Poundland store in Coalville where " Everything is a pound" and asked the spotty teenager behind the desk to confirm everything was a pound to which he replied yes, the look on his face when I put a pound coin in his hand and asked for the cash till was amazing.He obviously ( probably underage) did not drink Carlsberg as he refused.