You can, at least until your new Smart meter is installed!
The closure of the scheme does not affect installations which are already accredited. FIT support is payable for 20 years (25 years in some cases) and tariffs are adjusted annually by RPI. Your obligations under your statement of FIT terms will continue for the duration of your support. This includes your obligation to inform your FIT licensee about changes including, for example, installing battery storage with your FIT installation, replacing or moving metering, replacing generating equipment, or adding capacity.
To make any changes or to get more information please contact your current supplier.
For more info on Social Energy or to apply to join the #revolution, please contact firstname.lastname@example.org