The Boiler Upgrade Scheme is a UK government programme that offers £7,500 towards the cost of an air source heat pump or ground source heat pump. It is available to non-domestic buildings including churches, provided the building has a valid Energy Performance Certificate and the installer is MCS-certified.
The grant is applied by the installer, not the building owner, and it reduces the quoted price rather than being paid to you separately. Your installer applies through Ofgem, and the process is straightforward if they are experienced with the scheme.
The scheme currently runs until 2028. It does not cover like-for-like gas boiler replacements, only heat pumps.