I can't say I know much about this but a quick Google for the immediate and practical kind of problem you specifically mention seems to often lead to calling the NHS helpline on 111 for help and info. That's worth remembering - it's certainly not one I'd have immediately thought of.
This page specifically talks about the death at home www.dignityfunerals.co.uk/what-to-do-when-someone-dies/when-someone-dies-at-home/
This site also has some helpful info www.bereavementadvice.org/topics/what-to-do-when-someone-dies/
as of course does the macmillan site
www.macmillan.org.uk/cancer-information-and-support/supporting-someone/coping-with-bereavement/what-to-do-after-someone-dies
As far as letting officialdom know, the Tell Us Once service looks very useful, they suggest it will be offered when you register the death www.gov.uk/after-a-death/organisations-you-need-to-contact-and-tell-us-once
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