I worry about things most people aren't aware of. Like film size. In the US it's 4x5 and 8x10. In the UK it's 5x4 and 10x8. I'm OK with that. There's proper English and what we speak in America. Descriptive terms can be different.
In this forum we know the other guy (gal) is wrong in describing film size, but we are polite about it and get on with the photography.
Now, can some one tell me why it's 5x7 film on both sides of the pond? Why not 7x5?