How to form a gerund from “practise”? [closed]

I (think) I know the difference between practise (verb) and practice (non-verb).

However, I am not sure which form I should use in cases like the following ones:

I love practising the guitar.
You can try practising with this.

The question is tagged "British English". This answer addresses British English.

Practice is a noun. Practise is a verb. A participle is a verbal form so would use s, whether that is practised or practising.

Even when the word is a gerund (which functions as a noun), it's identical in form to the present participle so it uses an s.

My practising the piano upset the neighbours.

The neighbours dug a tunnel to escape from my piano practice.