is there a best time of day to sell bitcoin during the day in the uk? I imagine the trading hours of the us and china push the price up at certain points in the day.
Price increase can happen anytime of the day so it doesn't matter where you lived as timezone is not a big deal.
If planning to sell, then set a target at exchange to price you think you are satisfy or if you don't want that idea then just make you have time to monitor the price always. But if you are thinking of just holding it then just leave it alone and do your usual chores in real life. If you will checked the time of those massive price increase, it was vary and different.