We had a 17 hour blackout when storm Eunice hit last year. We were fine as we had prepared.
We have a wood burner so we made sure we had wood cut ready and indoors so we weren't rooting about outside in the dark.
We knew Eunice would hit around 12pm so we put the heating on constant and shut the doors in the rooms we heat. When it went off at 2pm as the storm hit the heat stayed in until early evening that way. Then we lit the fire around 5pm so there wasn't much drop in temperature.
We have summer duvets so they were brought downstairs to 'duvet up' as the evening wore on and it got a little chillier.
We have an electric oven but a gas hob so we were able to cook pasta with a sauce, boil a pan of water for hot drinks and hot water bottles for the beds (love our hot water bottles in bed). I did French toast for afters so we were well fed. We have a large 'spotlight' torch in the car so I made sure we had batteries for that and DH and DS took it in turns to 'spotlight' the pans whilst I cooked.
I'd moved everything around in our freezer so, if we were out for a few days (some parts of our town had no electric for four days), I wouldn't have to keep the freezer open for any length of time. So I put chicken, sausages, veg and bread at the top of our chest freezer so I could just grab what I needed.
We've always got torches ready as we do have power cuts now and then so we had one each to go to the loo/get drinks etc so the main room stays lit with candles/static torches.
We also charged up all the radios and just used one at a time to save the charge. We listened to radio 4 extra for a bit of comedy/drama then did board games by candlelight and read.
I'm getting plenty of batteries in for the torches. It's easy to do a stew or curry on the gas hob - gives the kitchen a bit of heat too - and I've always got some pasta sauces in. So food is covered.
We kept the freezer shut and only opened the fridge for milk so everything was still fine the next day.