TG in announcing his relaunch for 1st August...
"I'm not going as well as I hoped yet. I want to be doing 250 miles per day now. However, I have had days where I have averaged 18mph, so I know that I can go faster than I do on a lot of my rides (where I seem to average 16mph). Last week I decided to not use an alarm clock and just get up when I wake up naturally, so that I get as much sleep as I need. It has done some good, but the speed still isn't there, so now I am trying to ride gently to get some recovery into my legs.
We will know within a week whether it is working. I think it will take a good few days because I expect that I need a lot of recovery and that isn't easy when trying to ride over 200 miles per day. Currently, riding over 200 miles feels a lot harder than it ought to be. With a bit of recovery, it should get easier and I should get faster. Once I get faster, I will use that to gain more rest time before I bump up the miles so that I am as well recovered as I can be - which should make me faster."
So that explains the slower speeds.