On the subject of bread rolls - here is a selection from my school lunches:

Round shaped rolls:
Soft rolls
Crusty rolls
Barm cakes
Tea Cakes (with or without fruit)
Muffins (not like American muffins)
Oven Bottoms
Buns

Long/Oval shaped rolls
Bunnies

Crumpets (sometimes called Piklets) are rather different, a flat bread like thing, with holes in the top
http://www.ichef.com/ichef-recipes/Breads/18769.html
http://www.family.go.com/Features/family_0000_01/dony/breakfast/0327pikletbrk.html

The strangest thing I found on my travels was an “English Muffin”, discovered when I was living in New York. I had never seen anything like it in England. It was a little like a double crumpet with a flat top and bottom and a holey middle.

At that time I had a friend from the USA who was living in London. She was always discovering rather strange items purporting to be “American” so she told me not to worry. Recently a supplier must have discovered “English Muffins” in the USA and they are now on sale in England as “muffins”.