Lidl have responded to Sainsbury's infamous 50p challenge with their very own poster which tries to encourage customers to save as many 50ps as possible. This rubs further salt into the wound of Sainsbury's who embarrassingly had to try and explain their poster this week. However discounters Lidl and Aldi will have to keep on their toes as Morrisons announced this week they will begin their very own price match scheme which will also match prices of the discounters.