From: Rusty Dobro - PM
Date: 15 Oct 17 - 03:29 AM

As someone who once had an entire run of CD inserts printed to read 'practicing' instead of 'practising', I am in no position to take umbrage at SS's gentle and well-aimed correction.

Should have just blamed it on having spell-check set to US settings.
Even the OED (Oxford English Dictionary) gives:
Practice (vb): US spelling of 'practise'
Here
Useful to know if it prevents the cost of a reprint.