Brix - there's quite a few, depending on when you would think about a half, and what it's for - testing fitness or practising race conditions?
Garmin race your pace is on 15 Feb at Dorney Lake, or there's Liversedge in North Yorkshire on 9 Feb, Blackpool on 23 Feb, or on 2 Mar there's Edinburgh meadows, Bath, Silverstone, Drovers, Anglesey, Reading, Bideford, Berkhamsted... Take your pick!
If you didn't run it hard, you could probably get away with doing the Inverness or Alloa half on 9 and 16 Mar, respectively?
When I first ran the Great Scottish Run a couple of years ago, I saw a dad and mum and their little boy in a running buggy, and thought how nice it was to see that. So not everyone gets annoyed by them!
My 2 y.o daughter wouldn't be happy to sit in a buggy for 90 or 100 odd minutes whilst I pushed her round, so we've not invested in a running buggy. But I reckon if we did, she'd not mind a 5k parkrun every Saturday morning.
For parkrun or a half marathon, I'd speak to the organisers to make sure the paths are accessible for starters - there's plenty of races with steps up onto the pavement and into park paths, etc. I guess the short answer is if the race is ok for chair racers, shouldn't prove inaccessible for buggy runners?
Another hand up for attesting that a sub-3 can be run on around 25mpw. The biggest helps for me were longer intervals (usually 6 x 1600m) at the track once a week, and losing a couple of kilos in weight (weight loss was in Jan-Feb with careful eating - then maintained in March to May).
Bit of an ignorant question, but what was the prevalence of PEDs in endurance running / athletics at national competition levels and below in the 1980s? Not saying everyone was on drugs, but a fair few people on it would force a great lot of other competitors to completely smash themselves in order to keep up, so the whole level of competitiongets raised.