Is there anything good on telly tonight?
Why don't we place an article before "telly"? I think it should be "on the telly".
He enjoys the beauties of nature in Siberia.
Why do we use "the" before "beauties" and we don't use an article before "nature"?
Novgorod was the main Russian port for many centuries and was important for Baltic sea trade.
Why don't we use "the" before "Baltic sea"?
Immediately before this he had served as Chancellor of the Exchequer.
On Wikipedia we can see another variant, "The Chancellor of the Exchequer". Why don't we use "the" in this case?