Will try to keep this brief, as I could go on all day!
I don't have a diagnosis, but kind of self-diagnosed ASD at 23 (1996), as so muchinability to read people, never fitting in, interest in odd thingsresonated so strongly. However, a couple of things don't fit: I don't like routine (will try to find different ways to go between A and B); and I've always struggled with the idea of eg studying just one thing, as 'everything' is interesting to me to an extent. So I suspect ADHD, since I have all the problems with executive function, organisation, procrastination etc.; being extremely sensitive to criticism and having an avoidant personality (again, no diagnosis...yet) have prevented the jumping between jobs that others with ADHD often manifest.
I've been in the civil service for over 20 yearsbest job I ever had there was my 1st, in housing policy. Despite an immediate boss who thought I shouldn't try to get above answering correspondence, I asked for and was allowed to get involved with all sorts of stuffI had a good and busy couple of years when I was helping develop policy, represented the sector's interests cross-departmentally, got involved in various projects... Funnily enough, my executive function then was pretty good: eg I had a regular couple of hours set aside for email sorting every Friday.
That all went to pot in my subsequent jobs. I tried to get more interesting work in each, but was always knocked back. Often there literally wasn't enough to do full stop, and what there was was very tedious. Perhaps because of my ASD tendencies and general lumpen appearance, I wasn't/ haven't been taken seriously: I've always volunteered to do more 'stretching' work, but sometimes it was that the interesting work wasn't there, other times I was t being rejected or not listened to. I was more than once, and to my face, called "weird". Fear of criticism has always stopped me from challenging my management as to why they wouldn't let me do other stuff--fear of not being able to find another job beyond entry-level (am a graduate but was unemployed/ doing call-centre etc. work for 3 years after uni) has stopped me from issuing them or myself an ultimatum.
If I can get past the crippling depression I'm currently suffering with + procrastination, I'd like to study a GIS postgrad and change career. Given my experience, I wouldn't recommend the civil service if you want to be guaranteed interest unless the person goes into a specialist grade eg engineer. Fast-stream seems to give plenty to do, but from what I've seen (and having done the entrance myself) is best suited to extroverts who are obsessed with the utterances of ministers and self-presentation. (It's not so long ago that someone with ASD was told that her difficulties with eye contact and verbal presentation made her unsuitable for the fast stream.) IME the civil service likes to big up 'big D Diversity'ticking discrete boxesbut is not very interested in the myriad of ways that people are subtely different. Certainly IME there is in practice no interest in helping employees find/ be given work that engages them.