So this is all sounding a bit more encouraging. I submitted in February and was pretty certain - and gutted - that I was really going to be waiting 6 months.
Now I'm wondering whether it's worth trying to expedite. My family in the US is planning a reunion there for mid-June, and have booked accommodation, but we haven't bought airline tickets yet. I've been really desperate to see them all, especially my sister and her kids who live in Oregon, whom I haven't seen in about 3 years (and they're not in a position to travel to the UK). And under the 6-month wait I'd be simply SOL. A 4-month wait is sooo close to making it possible, but not enough to feel secure about buying the tickets (can anyone advise on cancellation insurance?). On the other hand the paperwork I got with my biometrics letter said pretty clearly that a holiday is not a valid reason to expedite. But. This is a special, pre-planned, I-haven't-seen-my-family-and-I'm-losing-the-will-to-live holiday.
Another thought is that we were going to combine this with a marketing trip for our new business which is still in the early stages. What kind of documentation would we need to demonstrate the work-travel requirement?
Sort of thinking out loud a bit...