Yes they are.
We're installing 'SMETS2', or second generation smart meters. They're compatible with all solar panels.
We do need to make sure there's enough space for the installation. We ask for 2 feet (about 60cm) of free space around your meter as a rough guideline. The engineer needs enough space to safely and comfortably get around the meter so that they can remove your current meter and get a new one installed.