On a recent trip to further afield (Australia), we decided to break up the long flights by stopping in Hong Kong for the weekend. This is a great idea, and one we highly recommend when traveling further afield. For starters flying for 20+ hours is just unbearable, and secondly you get to see another destination for very little extra money. This is one of our favorite tips for saving money on flight.
We found an awesome flight deal on kayak on with Cathay Pacific from Manchester, the flights were by far the best value with only one stop. The route was Manchester to Hong Kong then onto Sydney.