This is true. My main experiences with bacon in the UK was in fry ups, where it was invariably back bacon. I know streaky bacon exists, given that I know the name and it’s not called such in the US. I just thought “bacon” generically usually referred to back bacon, as opposed to the streaky bacon in the US (where we also commonly have back bacon in the form of Canadian bacon.)
FWIW it means the same in the loyal colonies anyway … 
It’s a rasher to me, here in NZ. By the way, this shows what bacon looks like. I think the “streaky” is what is known as bacon in the US. Middle or shoulder is what I’d expect to get served with my bacon and eggs.
Now that you mention it, I think the first time I ever encountered the word was when I was reading John Keegan’s The Face of Battle: the morning of 1 July 1916, every Tommy on the Somme was given “a rasher of bacon” and a mug of tea for breakfast.
I said “strip,” but that’s probably due to those “Beggin’ Strips” (dog snacks) ads. I suppose I call them pieces or slices, usually. Slices, pieces, strips, all good descriptive words.
“Rasher” seems more specialized, and is not a word I grew up with. Missouri with Ohio roots.
Kevin.
A milli-Arnold
…
Depends what colonies you mean. I’m from the Cape Colonies, and it’s rasher to me.
Or lardon.
I use all of the first three - piece, slice, strip - interchangeably, so I didn’t respond to the poll.