Phoned up the agency about the role and was put into the assessment centre 2 days later. Ensure you have all your documents to prove your right to work in the UK. The assessment centre took the format of talking the whole group through completing an application form and a DBS check form whilst they tell you a little about the company and the role. Then you're taken to complete a one minute typing test where they test your accuracy and speed. Following that you have an individual interview which is over in minutes. Easiest interview ever.