This is now resolved but just out of interest...
Shop has a large and high value item on a marked down price due to it being ex display.
Customer 1 goes over to the till to ask about it. Dithers for a bit. Doesn't place the order. Goes back over to have a look to help her decide whether to go for it or not.
In the meantime customer 2 comes to a different till and asks to purchase the item. Till operator 2 goes to get the bar code from the item.
Customer 1 then goes to the first till and says yes Ive decided I will go for it please. Till operator 1 also then walks over to get the bar code and meets Till operator 2 coming back with it.
Who gets the item customer 1 because she asked about it first or customer 2 because she actually confirmed that she wanted to purchase first?
Place your bets.