Reaching agreement may in any given case involve a lot of negotiation or very little, but no contract is created unless and only if the parties clearly signal that they have finished negotiating and are ready to bind themselves on particular terms. The process of reaching this point is often described in terms of an "offer" made by one party to another and 'acceptance' of this offer by the person to whom it was made.

By reference to the [1893] 1 QB 256, and any other decision you may consider relevant, explain what circumstances may distinguish an advertisement from being an offer, capable of acceptance so as to make a binding contractual agreement from an "invitation to treat"?