You need to apply for an export tariff with a supplier offering one; payment is not automatic when panels are installed. Compare export eligibility and terms alongside your import bill. Ask each supplier whether its offer requires you to buy electricity from it, what metering and certification it needs, and how battery exports are treated. The SEG is a Great Britain scheme; Northern Ireland needs separate advice.
Join the discussion: Are you comparing export-only offers or a package tied to your import tariff?
Suggested next step: Get the proposed export arrangements confirmed as part of the installation handover.