Re: On yer bike!
" I have been cycling 24 miles a day in London from zone 4 to Holborn and back - its awesome!"
You've been breathing the fumes too deeply - cycling in London sucks! It's better than the alternatives, but could be so much better with a little investment and some traffic enforcement.
Anyway, good on you for cycling so much and staying chipper - I do 22 miles per day and find that a grind by the end of the week or earlier when the cabs/weather/plane trees misbehave.