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On the invitation letter, it says bring a photo ID to the ceremony.

Has anyone done the ceremony without photo ID?

For fear of accidentally losing my passport (my country makes it incredibly hard to replace), I do not wish to bring it. What other ID can I bring?

Is ILR biometric card without the passport fine?

BRP should be fine.

As well check with your council, as some council are a bit fussy to have you get your passport ...