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...na/ on this coast due to Brexit the British population has been falling, (but sure you will find lots of Brits about in winter) however, the Spanish population growing, plus lots of other Northern Europeans moving here. Generally the winter weather is great, there are some good deals on Airbnb & you will find some with a British hosts, their properties high spec & due to tight regulations will have heating, important here in winter. https://www.airbnb.com/
There is a good firm in Benalmadena (note pronounced without the "L") https://cpgroup.business.site/ might be worth looking up, they deal with Visas applications to stay in Spain and accounting.(Note being a resident all your tax is paid here) One big minus no longer being EU citizens you can only drive temporarily as a foreign tourist, once resident cannot swap your drivers licence or use the British one, so unless a deal done with British Government people need a 'new driving test'. You now need Private Health Insurance to live here and fit the requirements of the Visa. Good news in the equivalent of Bupa which is Sanitas https://www.sanitasexpat.com/ it's only about a third of the cost in UK and the service is brilliant.
https://balcellsgroup.com/non-lucrative-residency/
'Good luck' I hope you find the links useful.