Ah ok - see I thought I'd double check so found the following on
https://www.dictionary.com/e/practice-vs-practise/.
'The verb practice/practise
In American English, practice is also used as the verb. It means “to do something repeatedly in order to master it” or “to pursue as an occupation or art.” So a churchgoer can practice their religion, just as a student might practice the violin.
In British English, the verb form of the word is rendered as practise. So in the above examples, our churchgoer practises their religion, while our student practices their instrument. This convention is true of British, Canadian, and Australian English.'
It was the bit at the end 'our student practices their instrument' that has me confused!