what do the rest of you envisage?
I think Steve that when the clocks go forward still will have got to a point where his is averaging just over the Godwin pace (complete guess: he will max out at 210 miles a day average) and will maintain that differential for as long as the weather holds out and then drift beneath it, but always within the realistic realm to make up the deficit in the Spring/Summer (if he keeps fit and well).
I suspect one of the benefits of his current approach, where he starts later in the morning, is that, come winter, the frost and fog will have a better chance of melting away by the time he starts. The trade off is riding later into the blackened hours, but I imagine that works better psychologically (I think it makes a different if you start in light and end in dark, as opposed to starting and finishing in the dark).
But all a guess. Steve is in uncharted territory for 21st century cyclists.
The unknown is whether he will be above or below the Seavogel line. Kurt is doing a proper job on the record, and I'd guess he will end a couple of 1000 miles beyond where Godwin ended up, all being well. That sounds a lot, but translates to 5 miles or so more a day on average that Godwin.