Begin with supplies you already have. Keep a working torch somewhere easy to find, check its batteries and know how to use your equipment.
A battery or wind-up FM radio can help you get updates when your usual connections are unavailable. Charge power banks in advance and confirm their cables and outputs suit the devices you plan to use.
Think beyond equipment: drinking water, food, warm clothing, personal supplies and ways to check on neighbours matter too. Anyone relying on powered medical equipment needs an individual backup plan with their care provider.
Read official UK Be Ready guidance and follow advice for your area.