I wouldn't use missing golden time as a sanction for several reasons. 1. I believe it important for children to have free choosing time from classroom resources and activities. So I see it more as a valuable learning session in the same way as subjects. 2. For year 1 it is too far away to be of any real use as a sanction. If you tell them on Friday afternoon they are missing 5 minutes due to messing about in PE on Tuesday morning they won't have a clue. 3. I prefer to start each day with a new slate. A sanction several days away is not doing that. I would keep with the missing playtimes, but make sure that the alternative to playtime is suitably boring and unpleasant so that they do mind. I'd also speak to parents if the child misses more than one playtime in a week.