Smoke Alarm Battery Replacement...
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No best answer has yet been selected by wheeler3367. Once a best answer has been selected, it will be shown here.
For more on marking an answer as the "Best Answer", please visit our FAQ.Travelling TO the UK with your UK passport should be no problem.
Travelling back should also be no problem - Spain allegedly accepts UK passports up to a year out of date. Your airline may not know this and not let you fly - or take so long to confirm it that the flight leaves without you. Best renew while you are in the UK.
I don't think your residencia card is of any use as a travel document, but ICBW. Presumably it's not evidence of Spanish nationality? If not, I can't see what use it is.