@The Hatt:
There have been a few forays by manufacturers into British HO over the years, most noticeably, Lima in the 1970's (which weren't very good, although I think they did a TGV in OO and HO or was that the Electrostar ?), Rivarossi (LMS Royal Scot ?) and Fleischmann (Warship, Bullied coaches).
Although there is a British HO group today, as a standard, it has never been popular and OO has always 'ruled the roost'.
To be perfectly honest, it isn't worth even considering British HO since British OO is so well supported.
If track gauge is an issue to you, there are the options of EM and P4, both of which you will be up for large scale conversions for, although it is easier with EM. My father built a P4 layout (https://www.mrol.com.au/Pages/Vu/Littlehempston). It was a huge amount of work, even for someone who is a professional permanent way engineer! The problem with P4 right now is that supplies of track parts have basically dried up. P4 Track Company sold out to C&L (IIRC) who seem to be intent on driving the business into the ground. Result is that my father has a layout that he can't complete due to parts supply drying up. Numerous P4 Track Company plastic sleepers are suffering gauge narrowing (plastic is unstable in our Sydney/Brisbane climate) which means that layout has basically failed. It is being dismantled in Feb and replaced with Ashburton - Model Railways On-Line. In my opinion, P4 is a non-starter and is only suitable for ironing-board layouts and nothing more. It isn't sustainable on larger layouts, especially for one-man constructions.
For EM, you basically need to be an EMGS member otherwise you can't get parts. Some may find this acceptable, some may not. EM certainly looks a lot better than OO without the hassle of P4, but I always figured that if you are concerned about accuracy, why stop with a 'halfway' measure (EM) which is still incorrect ? Why not go the whole way to P4 ? A conundrum.
Personally, I'd recommend staying with British OO. I built Ashprington Road - Model Railways On-Line using Peco Code 75 and it has been extremely reliable. Bullhead wasn't available at the time, but I'd consider it today.
Code 100 is a bit 'long in the tooth' for serious modellers, but it is the only standard used in the toy trainset world.
Another option is why bother with 4mm scale at all when we have such superb offerings in the 7mm space these days ?! (See https://www.mrol.com.au/Pages/Vu/0GaugeArticles) In O gauge, you don't need so much stock to make a scene because each vehicle is a scene in its own right.
There have been a few forays by manufacturers into British HO over the years, most noticeably, Lima in the 1970's (which weren't very good, although I think they did a TGV in OO and HO or was that the Electrostar ?), Rivarossi (LMS Royal Scot ?) and Fleischmann (Warship, Bullied coaches).
Although there is a British HO group today, as a standard, it has never been popular and OO has always 'ruled the roost'.
To be perfectly honest, it isn't worth even considering British HO since British OO is so well supported.
If track gauge is an issue to you, there are the options of EM and P4, both of which you will be up for large scale conversions for, although it is easier with EM. My father built a P4 layout (https://www.mrol.com.au/Pages/Vu/Littlehempston). It was a huge amount of work, even for someone who is a professional permanent way engineer! The problem with P4 right now is that supplies of track parts have basically dried up. P4 Track Company sold out to C&L (IIRC) who seem to be intent on driving the business into the ground. Result is that my father has a layout that he can't complete due to parts supply drying up. Numerous P4 Track Company plastic sleepers are suffering gauge narrowing (plastic is unstable in our Sydney/Brisbane climate) which means that layout has basically failed. It is being dismantled in Feb and replaced with Ashburton - Model Railways On-Line. In my opinion, P4 is a non-starter and is only suitable for ironing-board layouts and nothing more. It isn't sustainable on larger layouts, especially for one-man constructions.
For EM, you basically need to be an EMGS member otherwise you can't get parts. Some may find this acceptable, some may not. EM certainly looks a lot better than OO without the hassle of P4, but I always figured that if you are concerned about accuracy, why stop with a 'halfway' measure (EM) which is still incorrect ? Why not go the whole way to P4 ? A conundrum.
Personally, I'd recommend staying with British OO. I built Ashprington Road - Model Railways On-Line using Peco Code 75 and it has been extremely reliable. Bullhead wasn't available at the time, but I'd consider it today.
Code 100 is a bit 'long in the tooth' for serious modellers, but it is the only standard used in the toy trainset world.
Another option is why bother with 4mm scale at all when we have such superb offerings in the 7mm space these days ?! (See https://www.mrol.com.au/Pages/Vu/0GaugeArticles) In O gauge, you don't need so much stock to make a scene because each vehicle is a scene in its own right.
I would respectfully suggest that if someone is concerned about the discrepancies of OO vs HO and accuracy thereof, that a Peco SetTrack catalogue would be the last thing on their consideration list!