All the 'challenges' will completed with the bike set up as a single speed. I do like the fact there's no other options when the going get's tough to just get focused and battle it out.
Here's a pic of the Cotic (I bought it off an old member of this forum). Rear mudguard cracked at the base during my commute so I'm looking at modifying it to fit. Luckily at the moment the weather is too bad and I don't see one other cyclist my whole commute so no one get's sprayed. As for my riding mates on the weekend's.....I see it as encouragement if there ever behind me! haha! The V12's are on for the commute, at the weekend's I've got some Time Xpresso fitted. A few things will be changed over time notably the wheels but at the moment she does the job fine.
And here's a pic of my Ellsworth. Use this for trail riding however am considering either going for a pump track setup or maybe replacing the frame with something that has a 31.8mm ST so I can run a dropper post. Cotic Soul/Ragley Blue Pig, something steel.
I also have a Pashley 26Mhz trial bike. Had it for years and just can't bear to part with it even though it's in bits in the loft at the moment. I don't think I'll ever part with it. Really do need to get back into trials riding.