I tend to agree on that more flexible definition with a few core ingredients as baseline but it does seem to me that that core list needs to include at least one regional speciality item specific to the British Isles because I think that’s what the “full” part is really referring to as opposed to just a “fry up” as the other bloke suggested. I think in general in England that’s probably black pudding.
This thinking is because that minimum combination you listed is fairly common in a few places including Australia and while I don’t speak from experience, I think with the exception of the beans if wouldn’t be a totally strange or foreign combination in America either.
So this will obviously be personal, as you said maybe you just want validation for something you’d do anyway, but on the face of it without having access to the emotional and self fulfilment aspects of each proposition, leaving sounds like a really bad idea.
Leaving for higher pay, leaving for a new lifestyle and adventure in a new location, leaving for work you’d never have considered but will be really unusual and interesting or leaving for lower lay and insecurity but in a field you’ve always wanted to be involved and is worth more to you than the money and security; sure that all makes sense but unless I’m mistaken this sounds as though the other job is just a different job not one that holds a special appeal to you.
So unless there’s some extra psychological component to this, I can’t really see the advantage.