The standard is controlled by SACIT. All messages utilising the UKBTS envelope must comply with an approved message structure.
Proposals for new messages, or amendment to existing messages, should be submitted in the first instance to the Chair of SACIT. These will be reviewed by SACIT and if approved will be incorporated into the standard. While the objective is to obtain standards applied throughout the UK, the two-level structure does allow the flexibility of defining different structures at the message protocol level where essential.