@haitch40 @PeterJB
The reason countries such as Germany, France and Japan are famed for reliable trains is because they were bombed in WW2 and in the aftermath, those countries had the opportunity to rip up most of their existing railway lines and start again with more careful route planning and thought for future expansion and investment. Or in Japan's case I believe, actually start building them.
In Britain, we are stuck with the same infrastructure that has been going on with no future consideration since the 1820s. The railways which sprang up during
railway mania and later in the 19th century have created a network of lines which did not consider other existing lines or the effect of a national system. The fact that we were the prototype thanks to inventing the railway system means we are left with an infrastructure which will never be efficient; can you imagine the hassle and fuss and
cost to rip up British lines and starting again? Much easier to do when your country has been shelled into oblivion.
Curiously enough, the United Kingdom has privatised companies (excluding East Coast) and stations barring certain major stations but has nationalised infrastructure; the tracks and signals are all under Network Rail, which is not owned by the government but is not-for-profit and funded by the government. Incidentally, Japan and Germany both have private rail companies and are not fully nationalised industries.
The same can also be said of buses and roads in general; historic network not ripped up thanks to bombing leads to awkward networks.