Contact us

Contact us

We have published a set of Frequently Asked Questions which you may find useful for many enquiries.



If you can’t find the answer to your question on our website, please email us at

Please note that we receive an extremely high volume of communication, so we are unable to respond to general queries or observations.  

We regularly publish news about the Inquiry on our website. If you would like to sign up to receive regular email updates, please subscribe here.


General enquiries phone lineIf you would like to speak to someone by phone, our phone line is open between 09:00 and 17:00, Monday to Friday. If you have a query outside of these times, please email us.

Telephone number: 020 7215 2555 

If you would like us to call you back, please ask for a call back when the phone is answered or leave a voice message requesting a call back and leave your contact details. Alternatively, please send a message to the Secretariat inbox with “CALL BACK REQUEST” in the subject line.

Postal address

Post OfficeHorizon ITInquiry
5th Floor,
Aldwych House,
71-91 Aldwych,

Please be aware that we may not be able to respond to all postal correspondence due to the high volumes that we receive.

Media enquiries

Please find a dedicated page for media enquiries here.