You can get "briefcase" petrol generators that are fairly quiet and will supply sufficient power. Branded names start at about £300 upwards.
Obviously the more devices you want to run the more powerful the generator will need to be and bigger means more cost.
Thank you - I will look into that. We've managed without for years, but it would be nice to be able to use the fridge during a power cut.
Some helpful tips and ideas on how to achieve this at https://landlinesgo.digital/powercut/