The interview process took very long. Passed all the stages, however didn't receive any kind of feedback. Technical questions were reasonable for the position, just standard c++ knowledge and a bit of riddles n the end. The interviewers were very nice and friendly guys too. However not very pleasant HR, very fake and robot like.

Role provided by a recruitment agency. 1st stage was telephone interview, around 30 minutes. 2nd stage consisted of live Skype session with few problem-solving tasks - 30 minutes. 3rd stage was a face 2 face meeting in Kings Langley offices. 4th stage was telephone interview with HR. My application has been rejected because my salary expectations were to high.