A ﬁxed source of heating that's the right size to heat your main living room.
Ceiling and underfloor insulation has already been required since July 2019. The new standard is about making sure it meets new requirements and is in reasonable condition.
Bedrooms, dining rooms, living rooms and kitchens in your rental should have an openable window or door that can be fixed open to the outside. Kitchens and bathrooms should have an extractor fan to remove moisture.
Moisture ingress and drainage
Your guttering and drainage should be up for the job and if you have an enclosed subﬂoor (that’s the bit below the house if it doesn’t sit directly on the ground) it’ll need to have a moisture barrier.
Any noticeable draughts from unreasonable gaps or holes should be sealed up. Don’t forget that any unused open ﬁreplaces should be blocked off too, unless you want to use them.