MTB 55:00 [3] 15.25 km (16.6 kph)
Decided to give the MTB another crack, it works better with air in the tyres (and the bike is a lot more stable on gravel roads...).
Guessed time as left GPS at work so took old watch but stopped for a while to talk to some people and mispressed the start/stop/lap buttons (they're in a different place to what I'm used to!!)