Ocado Group Network Systems Developer interview questions

I was approached by a recruitment agent who has very close contact with Ocado. After they passed my details to Ocado, I was invited for an online test (3 questions in 2 hours). In 24 hours, I was invited for a face-to-face interview with timed pen-and-paper coding test, followed by an interactive whiteboard coding test with changing conditions/requirements. In 2 hours when I was on my way home, I was invited for a final face-to-face interview with heads of departments ASAP. I received an offer the next working day.