going back to the thread title....
I left my bike at work last night cos I was dining at Buckingham Palace and there is, apparently, nowhere to leave a bike (which was a relief as I was in full white tie regalia). When I left, I wished I had been on the bike as I had to bung a ludicrously large tip to a cabbie to get him to agree to take me home (sarf of the river an all that.) Coming home tonight wasn't too bad on the main roads as the traffic, curiously, wasn't that heavy so I didn't get much hassle when in primary, but as soon as I got off the A-roads I had to wheel the bike as the local roads were just sheet ice.
Picking up ItsBruce's comments, I was glad to be on fixed tonight. It just felt a little more secure, but I don't know why.