So i think you will earn almost 40 - 17.2461369 = 22 £ (if you don't win at all)
Copied straight from the Quidco website.......
PKR is the webs fastest growing online poker room with over 1million players signed up within its first year a record for the online gaming industry. PKR's unique and industry leading 'Emote control' technology, combined with a number of one-of-a-kind game features mean players who play at PKR can interact and engage with the game and each other in a way that's personal, involving and highly entertaining.
For genuine tracked transactions completed wholly online, you can earn:
£40 for a qualified player wagering $25 or more