Ever get confused whether to write ‘practise’ or ‘practice’?
Put simply, ‘practise’ is the verb and ‘practice’ is the noun. If you think of improving your guitar-playing then ‘practicing’ would look really odd and your brain would want to make it a hard ‘c’. You would write ‘practising’, which means you ‘practise’ on the guitar.
If you think of your GP practice as a physical thing then you’ll remember that with a ‘c’ it’s a noun.
We all know that practice makes perfect so you should practise all the time!! (Maybe the Americans have a point).