I've cycled home in the rain enough times, but cycling to work in the rain... not just getting to Lewisham and suddenly encountering some precipitation, but knowingly and unflinchingly venturing forth into the stuff... not until today. Once you make peace with the idea of being drenched from head to toe and the squelch in your cycling shoes it's not so bad. Kinda nice actually, as the rain pitter patters on your rain jacket.
I was impressed by the number of cyclists who braved the rain. Except for the buggers who don't have mudguards.