A weaker pound makes imported goods more expensive. If you're a fan of French cheese, Spanish wine or Japanese electronics, for example, that weakness is felt in your wallet.
According to Reuters, Sterling has dropped around 15% against the US dollar since June 23, leading to price rises in a variety of goods, from computers to clothes, to food. On the positive side, since there is strong competition amongst UK supermarkets: no chain wants to be the first to raise prices, which has benefited the consumer so far.
We'll see if any of the chains break ranks in the new year. In an interesting case, Tesco refused to increase the price of Marmite when Unilever put the price up, instead opting to just stop selling it instead. That's one way of dealing with the market fluctuations!