- Gruff Rhys – vocals
- Huw Bunford – guitar, backing vocals
- Guto Pryce – bass guitar
- Cian Ciaran – keyboards, backing vocals, chorus vocals on "Motherfokker"
- Dafydd Ieuan – drums, backing vocals
- Kris Jenkins – percussion on "Slow Life"
- Marcus Holdway – cello on "Slow Life"
- Sally Herbert – violin on "Slow Life"
- Brian G. Wright – violin on "Slow Life"
- Gill Morley – violin on "Slow Life"
- Ellen Blair – violin on "Slow Life"
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- Pete Fowler – Kaoss flanges on "Slow Life"
- Neil McFarland – Kaoss flanges on "Slow Life"
- 2Hats – rap on "Motherfokker"
- Maggot – rap on "Motherfokker"
- Billy Webb – rap on "Motherfokker"
- Eggsy – rap on "Motherfokker"
- Mystikal – rap on "Motherfokker"
- Mike Balls – rap on "Motherfokker"
- Adam Hussain – rap on "Motherfokker"
- Dwain Xain Zedong – rap on "Motherfokker"
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