Cling film is bad for cheese. It needs to breathe, so unwrap it when you get it home. Good cheese counters now wrap your purchase loosely in waxed paper, which is much better. Stilton is never aged for very long. It doesn't keep very well. Bath Blue and Stichelton are even worse: they can look fine when you buy them fresh-cut, yet three days later they can be definitely over the hill. Mature cheddar can still be great long after the use-by date on the wrapper. Months even!