Steve averaging better than 220 miles daily seems unlikely, given his recent average speeds and British riding conditions, even if everything else is optimised. Hopefully his cruising speed will improve.
I thought Steve was averaging 26kph at the moment, even in difficult conditions. What makes it unlikely that he will be able to average 220 miles a day?
220 miles at 26 kph is over thirteen and a half hours with the wheels turning
Allow eight hours for sleep - more would probably be good if he's to get fitter rather than tireder along the way.
That leaves less than two and a half hours to get up, go to bed, eat, toilet, bathe, do any admin or publicity, plan his route, fix any punctures, go to the doctor, stop on the road to sort his kit out, etc etc. Less if he needs extra sleep. It's not a lot of time.