This question is already answered here for the US but I'm wondering about the same case in Ireland. (apologies if this is a duplicate but I wasn't sure what to do in this case)
My wife and I were attempting to buy a vacuum cleaner in an electronics shop which was advertised on special offer at €270. The salesman made a point of explaining what a good deal it was given the reduced price. However, when we went to buy it, the salesman found out that the offer had ended the previous day, that they had neglected to take down the signs (which didn't feature an offer end date), and it actually cost something like €350. I attempted to argue that since the price was advertised at €270 and that's what we agreed on that he had to sell it for that price, but he said that while people think that's the case, it's not a legal requirement.
My question is, is it?