Although this book has many good deals, allways check! I attempted to book a hire car on-line using Hertz, and up came a price. Then I remembered the discount book and re-entered the details with my special MOD discount number. Low and behold the price went up about 35-40%!!! When I contacted Hertz all I got was a load a balls about corporate deals etc and an address to write to if I wasn't happy. So - always check!!