Initially I received a call from an recruitment agency. I took an online programming test on codility. After passing that, I got an offer to attend an interview day. Arrive at least 1 hour before the interview at the Hatfield railway station, because the bus takes 20-25' to get to the square. First we were welcomed by an HR member who took us to the testing room. There, we were handed two tests. We had maximum 45' for each. After completing the tests, a leader of one of the groups came and talk to us about the company, while our tests were getting assessed. After about an hour they came back and I got a negative result, so I left. The two tests were consisted of a pseudo code made up language and a Java test. The pseudo code one gave you 4 functions and you have to create all the remaining functions using those 4 functions while filling in blanks mostly. If you have any experience with assembly is quite similar but easier. The Java test is a basic linked list implementation where you have to create additional methods by filling in blanks again. Read a bit about linked lists, how to add elements in an unordered & order linked list and to the begin and end of it, how to use recursion to calculate the size etc. The tests seem to be the same for the last 1-1.5 years because I had friends taking them as well.