What, really? No, I don’t mean to suggest I disbelieve you, as I actually find it quite cute in a way. It’s much like the tales of people who want to marry without a fuss, so they just grab a couple of witnesses from whatever passers-by happen to be around.
After all, it still mostly fits in with the normal idea of random selection of the adult population, and I expect any person called like that would be subject to the same “many are called but few are chosen” thing as those done by the blindly sticking of pins into the electoral register method, but it just is sort of cute and funny. One imagines all sorts of bad happenings in the whatever locality - weather problems leading to complete breakdown of transport thus non-appearance of the predicted pool of potential jurors, unexpected nuclear strike leading to shortage of people and so on. Large percentage of potential juror pool eaten by dragons, that sort of thing.
But the only times I was called, well, the normal way, is “this here letter says you MUST, you simply MUST, turn up (or 'phone giving your reference number to find whether you must, or need not) at the High Court on Monday the nth, otherwise we shall be MOST displeased, and you would not like us when we are displeased, oh no! Otherwise, find a good excuse, like advanced old age or a medical reason, which must be certified by your doctor and sent it to us in official-type writing damn fast.”
But, come to think of it, just grabbing potential jurors from the street at least does away with the inability thing, doesn’t it? I mean, anyone happily going about their business when grabbed by the keen young court-attendant person is, by definition, not in hospital dying of the Black Death, so that’s one objection done away with.
Of course, were I the evil criminal due to be tried, and were I to know of this idiosyncratic system, I might just want to persuade some friends to “happen” to be passing by the court at the appropriate time (Hmmmm … there is potential. Do we have any Dopers who could write a short comedy based on this whole lovely idea of juror selection the easy way? )
So then, for the O.P. Mr. Shine, perhaps take a day off work and loiter around the court. Take some sandwiches and water/fruit juice, sit around ever so nonchalantly and, you know, just lurk around and see if anyone solicits your services.
Of course, it just might be the local police enquiring as to precisely why you are so determinedly loitering around …