Identity cards were scrapped in 2011 - they’re no longer valid and you can’t use them as proof of identify.
You don’t have to return your identity card. You should destroy it or keep it in a safe place.
The fee you paid won’t be refunded.
The government securely destroyed the personal details of everyone who had an identity card.
You’re from a country outside the EEA
The changes to identity cards don’t affect biometric residence permits (previously known as identity cards for foreign nationals). These are still valid and you can continue using them.