Any advice ?

You should have plenty of cash rolling around with that sort of income. Enjoy! 

with the new regs for residencia you may need private heatlth insurance which could be costly depending on your health problems.  if you are already in receipt of your state pensions you may beable to get a registration for the Spanish system, not sure what happens after Brexit some one else will know.  You have to factor in the need for a translator as the doctors will not usually speak English when dealing with complex health problems.  Money wise you should be well off if you don't smoke or drink, we have several coffees out daily and meals both lunch and dinner.  You can have your state pension paid straight into your Spanish bank account at a favourable rate from the British government.

I think you should be ok, but certainly not 'rolling in it',  as you have to think of electricity which is expensive here, internet charges maybe, insurances (car and home),emergency fund in case of extra expenses like car maintenance or repairs and  imported foods from the UK are expensive here as are convenience foods of most types.  I usually cook from scratch here.  I also rarely eat out more than once a week and it is usually a 'Menu del Dia' - About 11 Euros each for 3 courses often including a drink.  You may want a pet and have to think of food, vet's expenses and occasionally boarding kennels if you go away, and also you need to make a tax return every year and that's another thing you might have to pay someone to help you with if you don't speak enough Spanish.  You will have various expenses like Spanish EEC driving licence - cheap if you can do it yourself but not if you have to employ a gestor yo help you. You will live reasonably but it won't be like bring on holiday.,

Also, if you wish to drive, you may have to factor in the cost of a a Spanish driving test as Tráfico have advised the cutoff date for swapping UK licences to Spanish was 31/1/20