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nankatsu
Planning and Building Control are separate entities. Planning (and Permitted Development) relate to what can be built, Building Control is required to confirm that the proposed/built works comply with the relevant Building Regulations.
Item 1 would definitely have required Building Control sign-off. Assuming item 2 was a new bathroom and not a refurbishment of an existing ensuite, then it would also have required Building Control sign-off.
A retrospective Building Regs certificate from your Local Authority is likely to be slow, intrusive, and potentially expensive if the works do not comply with today's Building Regs. Indemnity insurance for both will be the easier/less painful option.