This is a collaborative post. It’s not just presents that end up costing a fortune at Christmas. Although with children and family to buy for, spending on gifts soon adds up. But it’s the other stuff too. Like the fact that I see it as a personal challenge to make sure that there are no mince pies left at the end of any day. Which means buying more the next day. I estimate my mince pie costs alone to be in the region of £29,384,795 per year. Well, maybe not quite that much. But you get the gist. So, I’ve…