28/05/14: This week our money experts discuss investment supermarkets; explaining what they are and how they could be a good investment option. They also offer advice on booking your summer holiday; with tips on the best days to fly and how to haggle down the cost of your trip.You can share your thoughts and experiences on these and other money issues on Twitter: twitter.com/WhichMoney, or join the conversation by using the hashtag #WhichMoney.For more information and expert advice on the topics discussed in this week's programme, visit www.which.co.uk/moneypodcast