Kings Cross and Charing Cross.

Depends by what you mean by "around London". If you mean in London it's only Kings Cross. If you mean from "some miles around London", then add Stevenage (same line as Kings Cross).

Trains don't go from Kings Cross to Manchester. They leave from London Euston which is a 10 minute walk from Kings Cross. The journey from London Euston to Manchester Piccadilly takes around 2 hours 10 minutes.

There's one in London and one in NSW

Kings Cross Station