This is very much a red-letter day. England pass 300 in one-day internationals very rarely.
Where other nations are forever launching sixes and sailing past 300, England are usually batting quite sensibly for a bit before thinking ‘OH MY GOD! WHAT ABOUT THE RUN RATE? WE’VE TOTALLY FORGOTTEN ABOUT THE RUN RATE’.
The run rate’s rarely that bad, but the minute one of the batsmen thinks this, the rest of his team mates all take their cue to start spooning catches to mid-on. It rarely has anything to do with the bowling and usually has everything to do with batsmen thinking ‘OH MY GOD! WHAT ABOUT THE RUN RATE?’
There was some proper slogging in there too. In one-day cricket, this is very much a good thing.