This is quite common in Blighty; there is no need for another ticket (outside some time restricted fares where the ability to stop is limited). Indeed, it can be nice hopping off at a new city for a mooch around if you have time to do so.

(Only slightly off-topic; We have the phenomenon of 'split tickets', where it can be cheaper to buy two tickets from A --> B --> C rather than one ticket from A --> C even when the train stops at B anyway! You don't even need to get out of the train at B if you don't wish to do so. Our ticketing system is a mess.)