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I have a somewhat similar layout in terms of kitchen and I didn't require a door between the kitchen and hallway. There had to be a hard wired, connected heat sensing alarm in the kitchen. However, I think the rules change if you add a loft conversion (due to the height).
Some reading here https://assets.publishing.service.gov.uk/government/uploads/system/uploads/attachment_data/file/937931/ADB_Vol1_Dwellings_2019_edition_inc_2020_amendments.pdf
So do you think we'd still need to put some kind of double/folding door into that large opening and to the kitchen to comply or would having all the smoke alarms be enough?
I think this is why I need to chat to BC inspector, at least to get an idea of costs involved