So, if you are looking to take advantage of bonuses offered through online casinos in the UK, be sure to keep reading! What are wagering requirements in UK casinos? On this page, we will explain exactly what wagering requirements are and how they work. Online casinos that offer bonuses are almost certain to feature wagering requirements, which can impact how easy it is to withdraw winnings. However, bonuses come with terms and conditions, with wagering requirements arguably being the most important. PART of the appeal of playing casino games online is the bonuses that are up for grabs.