SO you also have to register in pereson at the Excel centre, in London, on one of the three preceding days.
How on earth are people living outside the home counties going to make that work? Come to think of it, even living in the home counties doens't mean that isn't going to be a major faff.
Is this not the same arrangement as per London marathon? Doesn't seem to put people off doing that.
Pretty sure it would be impossible for the organisers getting everyone registered on the day.