In terms of outside, I get the gutters and drains cleared. Check the general condition of window and door exteriors, downpipes and roof, Insulate any exposed pipework. I also move the greenhouse and bins to a more sheltered spot and secure our shed against strong winds/storms.
Inside I get our boiler serviced, bleed radiators if needed, get the draft excluders down from the loft and rugs for the wood floors downstairs,
change the duvets to the winter ones and add blankets to each bed, check the condition of hot water bottles, make sure the kids wellies and coats fit, if not buy them new ones.
I also check our emergency box which contains supplies for bad weather and/or power cuts
-pillar, stick and tealight candles
-12 x match boxes
-10 x lighters
-batteries
-5 x torches
-2 x 20000mah power banks
-camping stove and gas bottles
-several sets of fairy lights
I add umbrellas, winter hats and gloves to the cabinet next to our front door and a bunch of those instant 12h hand warmers. Also ensure I have an extra months supply of prescription medication and OTC medicine.
Theres probably loads I’ve forgotten but that’s what I can remember off the top of my head