When it comes to new trains being introduced in the UK, it seems like there is always a default option when it comes to which sort of train operators will go for. For example, if an operator needs a suburban or regional passenger train with double doors, then they will most likely opt for the Aventra. London Overground, South Western Railway, the Elizabeth Line, Greater Anglia, and West Midlands Trains all opted for this choice with the only difference being that WMT's choice had end gangways in place. Meanwhile if you're wanting a high-speed intercity train with saloon areas and doors at the end of each coach, then the default choice is pretty much the Hitachi AT300 series. Great Western Railway and London North Eastern Railway kind of had to accept these trains because of it being part of the InterCity Express Programme in their respective franchises, but since then we've had Class 802s being chosen by GWR, Hull Trains and TransPennine Express, Class 803s by Lumo, Class 805s and 807s by Avanti West Coast, and 810s by East Midlands Railway with a redesigned nose being the only physical distinction. I understand that from a technical standpoint no class of trains are the same, with some being electric and others being bi-mode, but it seems like the options available to operators are practically monopolised.
However, having said that, I don't really recall it being much different in the past. Even though it seems like the AT300 is the default product for it's niche, it still has yet to cover every route operated by HSTs that it replaced. Additionally, the Aventra is also not simply a new train family but is in fact a successor to the Electrostar trains that very much dominate the Southeastern network. Sometimes the options are also limited because at the moment there is not many other proven options for a bi-mode intercity unit except for the Stadler FLIRTs by Greater Anglia, and this really isn't too different than back when the need for tilting trains on the West Coast Main Line lead to Alstom being the obvious choice because of how the Pendolino was already a proven design in mainland Europe. The same also applies to the Siemens Desiro which was seen in the form of the Class 350s for London Midland, Class 360s for Greater Anglia, Class 380s for ScotRail, and Class 444s and 450s for South West Trains, though these did also have a little more variety in their design features. From a business point of view, especially with the railways in this country, the safe option of opting for an already proven design is smarter than taking the risk on a new one unless you're catering to particularly unique specifications.
With all that said, I do still wish to ask the question as to whether or not train manufacturing in the UK has become less competitive and less varied than it did in the past. If so, then I also ask why might this be the case? I'd love to hear people's different thoughts on this matter because I myself generally don't have a solid answer for my own question, so I'm hoping that this thread might be able to enlighten me a bit.
However, having said that, I don't really recall it being much different in the past. Even though it seems like the AT300 is the default product for it's niche, it still has yet to cover every route operated by HSTs that it replaced. Additionally, the Aventra is also not simply a new train family but is in fact a successor to the Electrostar trains that very much dominate the Southeastern network. Sometimes the options are also limited because at the moment there is not many other proven options for a bi-mode intercity unit except for the Stadler FLIRTs by Greater Anglia, and this really isn't too different than back when the need for tilting trains on the West Coast Main Line lead to Alstom being the obvious choice because of how the Pendolino was already a proven design in mainland Europe. The same also applies to the Siemens Desiro which was seen in the form of the Class 350s for London Midland, Class 360s for Greater Anglia, Class 380s for ScotRail, and Class 444s and 450s for South West Trains, though these did also have a little more variety in their design features. From a business point of view, especially with the railways in this country, the safe option of opting for an already proven design is smarter than taking the risk on a new one unless you're catering to particularly unique specifications.
With all that said, I do still wish to ask the question as to whether or not train manufacturing in the UK has become less competitive and less varied than it did in the past. If so, then I also ask why might this be the case? I'd love to hear people's different thoughts on this matter because I myself generally don't have a solid answer for my own question, so I'm hoping that this thread might be able to enlighten me a bit.