Thank you all for your help.
I have now got it working! I have a variable that holds whether it’s the players turn or computer’s turn. As all the functions are in if statements dependant on this variable (like a game_state variable) I set it to ‘wait’ immediately before I want my wait & then my action sequence calls a function to set it to ‘computer’ after the wait.
Thanks again for the extra info on how wait works - don’t think I would have got there on my own!