Unfortunately my head just wasn't with it on the day due to having worked exceptionally long shifts in the run up to the assessment centre.
The centre ask you not to give explicit details of the assessment day and so I will respect their wishes, however there is a group interview/task followed by an individual interview.
As an aside, in response to people asking whether age plays a major role in the selection process, the chap who was assessing me was a BA 777 pilot, and he stated that last year's intake had several people who were over 40 years of age, so don't let that aspect put you off going for it.
Best of luck to all still in it.