99p Stores

Fantastic range of goods on shelves. The aisles are well spaced out to allow shoppers to pass freely. Shop very clean and well stocked. Items are clearly marked on the shelves i.e. 99pence or 2 for 99pence. However, no itemised till receipt is given to customer and today my shopping came to £35.64p. which would symbolise 36 items at 99p each...However, several of the items I purchased were 2 for 99pence and my final bill should not have exceeded £30.00...so what originally appeared to be a bargain ended up being full priced items as each purchase was charged at 99pence. Without itemised till receipt it would be impossible to return to the shop to raise a query ...is it not a legal requirement for a customer to receive an itemised receipt when making a puchase????