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Hi, my eea2 application is currently under process(applied Nov 16) and we are moving to a new house next week, how do I notify the HO about this and what documentation do I need to send please if any?

Thanks in advance

You could try calling the Home Office for advice,

https://www.gov.uk/contact-ukvi/european-nationals

Or maybe this is the right form?
https://visa-address-update.service.gov.uk/

Thanks a lot