Im in the UK where Prime free delivery option is next day. And they 3/4 of the time to deliver the next day. the 1/4 rolls over to a 2 days delivery. I live to

Im in the UK where Prime free delivery option is next day. And they 3/4 of the time to deliver the next day. the 1/4 rolls over to a 2 days delivery. I live too far outside London to use Prime Same Day and Prime Now options. (I.e same day and 2 hours delivery). I would be interested in how often they meet those much tighter delivery times?