The interview started with an online application to the recruitment company who handled everything, however now it is all done in house. Aside from the usual name / address etc. a few skills based questions had to be answered, to show where you have demonstrated certain skills they looked for (linked to the core values). After that initial screening processes from what I remember there were 2 online SHL based test (numeric and verbal reasoning). Then came a telephone interview where the recruiters got a general feel of what I was like and eventually I was invited for an assessment day. The assessment day consisted of some talks about what the company does, a group assessment, panel interview, solo presentation and a Q&A session at the end. That was pretty exhausing in itself, then after that I was actually called back for another interview with the head of department to ensure I was the right fit for the job. The whole process from apply to acceptance of offer took around 9 months.