I did this on Saturday morning, but as I was jumping in the car to go down to London a few minutes later I didn't have time to upload it.
So here it is, for better or worse:
17 stone 9 pounds - a loss of 4 pounds since I started this. Given I haven't yet begun any proper exercise, this is solely down to a change in diet so I think this is a reasonable start. In the months to come, I think I'll be glad to lose this amount in a week.
And before anyone asks, yes I do have more than one pair of sports socks that are the same. And, yes, I'm aware of the irony implicit in me owning any 'sports socks', thank you.