Went for another ride around the lake last night. I left work late, so I didn’t have time to do a full lap before it got dark (should really buy some lights) but I still got a 21.2kmh ride in, with an average speed of 29kmh which was pretty good. It felt quite easy as well. The only downside to riding at dusk was the clouds of midges at various parts of the trip. Had to make sure I closed my mouth before passing through the cloud!
On a positive note, when I get around to doing a triathlon I’d be aiming to average 30kmh or so on the bike, so I shouldn’t have too much trouble doing that based on last night’s ride, especially if I was on a road bike rather than an MTB. Now all I have to do is learn to run!