You literally couldn’t re-apply, as you would have too much experience:
https://en.m.wikipedia.org/wiki/Medical_Training_Application_Service
There was one opportunity for experienced SHOs to apply in 2007, and after that all posts in all specialties were meant to be run-through, and earmarked for people who had just finished foundation training. You could not have more than two years of post-graduate experience when you applied for ST1 - your application would be automatically rejected. There was not meant to be a further point of entry at ST2, ST3, etc.
Obviously they backtracked on that in subsequent years, and also split core training from higher specialist training. But in 2007 when it was introduced and my colleague killed herself, you were appointed as an ST1 in cardiology and were guaranteed a run through post to ST7. You may not remember medical unemployment, but it certainly existed - I was unemployed and left the country, and so did at least 50% of my colleagues on the medical rotation in my hospital.
That is why there were protest marches through London, judicial reviews, etc.