[conjectures]

> I quite fancy doing a Phd myself one day, but I assume I'd have to do it in "stealth mode" unofficially for a few yrs without a supervisor first

I'd suggest you think very carefully about this first. There's a very high chance the stealth mode work will be non-useful for getting onto a programme. Similar to how working on a 'build it and they will come' approach is generally disadvised for startups. Obviously it depends on how much of a lone genius you are but only you know that ;)

[nickd2001]

Thank you for friendly helpful advice :) Yeah I've misgivings too. Ha ha I've no idea whether I'm a lone genius or not. I've a hunch for an approach to an area of study which I believe other people have steadfastly ignored or not noticed. Now either (a) they're all informed and I'm not, and they're right not to waste time on such a fruitless approach or (b) I'm on to something worth pursuing. Only one way to find that out. ;) My plan was to try to produce something then demo that to a potential supervisor. There's a couple of professors from when I did my MSc, one in particular is a very nice person who'd probably be interested and at least give it a (healthily critical) hearing. Well, good people of HN you're welcome to reply and shoot down this approach or encourage it, whichever makes most sense. :)