Quidco launched their service in 2005 and have since become the largest cashback site in the UK with over 4 million members to their name. Started by Paul and Jen Nikkel while at Sheffield University the company has continued to expand and now has over 100 members of staff between their Yorkshire and London office locations. Quidco have cashback offers for a number of different sectors so whether you are spending on travel utilities mobile tariffs or clothing you are sure to get a great cashback deal.