Confirmed companies include

7 Steel UK
ACT Group
Action Sustainability
Allwyn entertainment ltd
amfori
Anthesis
Applegreen
Aviva
Balfour Beatty
Baxter Freight 
BT
Bupa
Calisen
Carbon Co Ltd
City Electrical Factors Ltd (CEF)
City of London Corporation
Civil Service
Clarion Housing Group
Climate Group
Consilient Health
CPL Aromas
CUR8
DP World UK
EcoVadis 
Environment Agency
Era Home Security
FIS
GreenScale Data Centers
Haleon
Hilton Foods
Hispec Electrical Products Limited
JRP Solutions 
LBG
Lloyds Banking Group
M Group
Mills and Reeve
Motability Operations Ltd
OCU Group
Promar International Ltd
Quanex
Reckitt 
Reconomy
Riverford Organic Farms
Royal Mail
Saba UK
Sagana
Saïd Business School, University of Oxford
Sanctuary
Seismic
Sisk
Specsavers
Sustainable Film
SWR
Talan
The Climate Group
TLT LLP
University of Exeter
WaterAid
Welcome Break
Willmott Dixon
Winvic Construction
Wylde Connections
Zurich Resilience Solutions 

Confirmed job roles include

Associate Director
Carbon & Climate Change Manager
Co-Founder and Chief Scientist
Contract Manager
Corporate Account Manager UK & Ireland
Group Supply Chain Sustainability Manager
Group Sustainability Director
Group Sustainability Manager
Head of Compliance and Sustainability
Head of Content
Head of Sustainability
Head of Sustainability and Net Zero
Head of Sustainability Programmes
Head of Sustainable Supply Chain
Manager - Procurement
Nature lead - Supply Chain Sustainability
Net Zero Supply Chain Manager
Net Zero Technical Specialist
Partnership Development Manager
Partnership Director
RE100 Senior Engagement Manager
RE100 Senior Technical Officer
Regional Sustainability and Environmental Manager
Risk and Sustainability Director
Senior Director - Sustainability
Senior Director of Decarbonization
Senior Net Zero Manager
Senior Sales - Climate Risk
Senior Sustainability Manager
Senior Sustainability Officer
Supply Chain Sustainability Manager
Sustainability Apprentice
Sustainability Consultant
Sustainability Coordinator
Sustainability Engagement Manager
Sustainability Lead
Sustainability Manager
Sustainable Procurement Lead
Sustainable Supply Chain Manager
UK & Ireland Network Representative
VP Commercial & Supply Chain UK