The Centre is currently obliged to abide by the non-statutory Code of Practice on Access to Government Information. It is also regulated by the Parliamentary Commissioner for Administrative Affairs (the Ombudsman).
They are responsible for producing their own publication scheme and dealing with requests for information they hold under the Freedom of Information Act 2000.
You can contact them at:
The Director
Great Britain-China Centre
15 Belgrave Square
London SW1X 8PS