Aberystwyth
Exploding Fish (Aberystwyth University)

Bangor
ImpSoc (Bangor University)

Birmingham
Box of Frogs
The Improlympians
Upstairs Improv

Bournmouth
ImprovWithUs

Brighton
Brighton Improv
The Hee-Ha's
Impromptyou
John Cremer
Katy and Rach
The MayDays
Musical Improv Comedy
The Noise Next Door
Off the Cuff
Short & Girlie Show

Bristol
Bristol ImprovSoc (Bristol University)
Instant Wit
The Wardrobe Theatre

Cambridge
Hoopla Improv Cambridge

Canterbury
Slow Loris Impro

Cardiff
Ignition Improv Comedy
Ludus Ludius
Patrick Harries

Cheltenham
Off The Cuff

Coventry
Impro Vivo
Wow Impro

Durham
ShellShock! (Durham University)

Edinburgh
The Improverts
To Be Continued

Exeter
Improperly

Hampshire
Instant Soop

Lancaster
We Are Improv

Liverpool
Impropriety
Improm2

London
8BitImprov
Austentatious
Abandon Theatre
BYT Experimental Theatre Group
Cannonball Impro
Catch23 UK
The Comedy School
Comedy Store Players
The Cot
Crunchy Frog Collective
David Shore
Dead Man in a Box
Do Not Adjust Your Stage
Fat Kitten
Fluxx
Friendly Fire
Grand Theft Impro
Hoopla Impro
Improbabble
Improdigies
ImproFest UK
Impro Jam
Imprology
Impro Monkeys
The Improsarios
Improvedy
Improvisers Anonymous
Improvibe
Kevin Tomlinson
LAIM
London Improv
Marbles Improv
The Ministry
Music Box
Miss Orla
Mixd Nuts
Pete's Performers
The Scat Pack
The School of Night
Scratch Impro
Shotgun Impro
Showstopper! The Improvised Musical
Sprout
The Spontaneity Shop
The Sticking Place
Third Person Theatre

Manchester
ComedySportz
The Grinventors

Newcastle
Matt and Ian
Newcastle Improv
On the Spot
The Suggestibles

Nottingham
Missimp
Student Improv Nottingham

Oxford
OCDImpro
Oxford Impro
The Oxford Imps (Oxford University)

Oxted
Boodoo Improv

Peterborough
You're in Control

Reading
Hoopla Improv Reading

Sheffield
Shrimps

Southend
Scared Scriptless

Stirling
Improveteers (Stirling University)

Associate groups outside the UK
Alan Marriott (Vancouver, Canada)
Crunchy Frog Collective North Shore (Vancouver, Canada)
Patti Stiles (Melbourne, Australia)
The Craic Pack (Dublin)