Following a request on the ICG e-group, here is a list of member-recommended venues for workshops…
Breather – https://breather.com/locations/london/crinan
Arlington – https://www.arlington.org.uk/conference-facility
Sunbeam Studios- https://www.sunbeamstudios.com/spaces/
I-View London – https://www.i-viewlondon.com/studios.php
Wallace Space – https://www.wallacespace.com/
Sutherland Labs – https://www.sutherlandlabs.com/spaces/
The Tank – https://www.sohost.co/the-tank/
If you have any more suggestions for London (or elsewhere) let us know and we will add it to the list.