Quick update - I emailed the cabinet office using the email address at the bottom of the job advert, rather than the DWP recruitment one, and received this response this morning....
We are unsure as to why candidates can see their scores and feedback, as interview results have not been released yet. We are awaiting a response from our support team on this issue. Please bare with us, and we will release the scores just as soon as possible.
DWP use a weighted scoring system for the strengths scores. So you add the total of your strengths scores and times them by 1.75 (i.e 3,3,3 = 9 x 1.75 = 15.75 but round up to 16). Add this total of your behaviours score, and this will be your overall score.
I hope this has made sense.
No, not really....