Re: Rover = bicycle
I'm sure if you went through a stationery catalogue in the UK, all sticky tape products made by "Sellotape" would be capitalised. But in general usage by the public, we don't capitalise it because we no longer think of it as a company name.
"Scotch" is very rarely used in the UK to describe the nationality of people. "Scottish" is the most common word. "Scotch" is still used to describe food with Scottish origins: Scotch whisky, Scotch eggs.
Remember - correct capitalisation, punctuation and spacing make posts much easier to read.