=>Several manufacturers have tried UK HO and all have failed, the 'base' =>market in the UK will no more go over to HO than Europe/Us would go over to =>P4. The user base is too big for that number of people to say "I know lets =>throw all my existing models away and start again", and the manufacturers =>look at it and think " well a few have tried and all have failed, I aint =>going to waste any money doing that. If I really want to start in the UK =>I'll stick with OO as Heljan have done". =>
=>Just my 2p =>
=>Jeff
I agree the unwillingness to "throw out everything" is a major obstacle, and it's the same unwillingness that keeps far too much old junk in circulation IMO. One of the more common requests in this forum is for help in making that old junk run, another is the plaintive wail that no recently manufactured old junk is available. Good grief!
However, most people are willing to toss old junk, perhaps relegating some of it to the showcase for sentimental reasons. I'm sure a lot of 30 year old Hornby is being replaced by current Bachmann, for example. So starting over with a scale change would not be much more difficult psychologically. The biggest problem would be replacing the buildings, but people do that too, as their skills and self-impsoed standards of quality change.
Here in N America there is a remarkably large market for European HO - people do like furrin stuff, you know. And there are an amazing number of British outline modellers, too. I dabble in it myself -- but I would much, much rather have HO than OO models. The OO models on 16.5mm track just don't look right. Ugh!
IMO, there's an unrealised, unrecognised potential market for British HO outside the UK. Combined with the UK market (and it exists, or could be created - people who are starting a layout could be persuaded to go with HO instead, I think), there may be enough critical mass for the HO to take hold and grow. Technically, it shouldn't be that difficult - if certain parts of the mechanism are designed with a bit of cunning, producing both OO and HO models with most of the mech in common should be feasible. In fact, it shoul be a breeze, since most mech parts are common over many models. The more expensive proposition would be the molds, but their cost has fallen in real terms - hence Bachmann's ability to provide a range of good quality models in a minority scale. Once the molds have been made for one scale, a second set would not be not nearly as expensive as one made from scratch would be. IOW, the incremental cost of making HO models should not be onerous.
BTW, I've investigated P4 and similar efforts; they are for the craftsman, and the range of supplies reflects this. If most UK modellers want to keep
4mm scale, there really should be an effort to make replacement of OO with P4 wheels and bogies dead simple - there's no reason Hornby and Bachmann etc can't build carriages with screwed on bogies, for example, so that a swap is just a few minute's work.