What got me in Ireland was the difference between a sausage roll and a breakfast roll. You’d expect them to be roughly the same, but not at all.
Although a hot sausage roll[1] is perfectly acceptable as a breakfast food, it is not a breakfast roll. :)
Edit: Mis-read 'Ireland' as Northern Ireland (Oops!), which is of course not part of the UK!
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Sausage roll: puff pastry filled with sausage meat (no skin).
Breakfast roll (with clarity for non-Brits): half a full English on a roll i.e sausage (with skin, perhaps halved for convenience), bacon (back not streaky) and fried egg ("sunny side up" and "over easy" - a fried egg not done this way is very poor form).