Our favourite chocolates and biscuits are coming in ever-smaller sizes. Is this good for our wallets as well as our waistlines? Supershoppers reveals which brands to avoid when it comes to cost. Plus: coffee loyalty schemes: how much does it really cost to get a free coffee from the nation's biggest chains? Anna and Andi also investigate travel insurance: are we being fleeced when we fly? And the eye-watering cost of West End theatre tickets: how can you bag the cheapest seats in the house?