I am arriving in san telmo this week but need a lateral flow test to return to england please can some one tell me where I can get one

You will need a PCR test. https://www.clinicarotger.com/en/covid-diagnostic-tests-pcr-and-antigens-rotger-clinic-mallorca-hospital/

They are very efficient, working under large amounts of pressure. Make sure you book before you go, otherwise you may queue for 4 hours.

Good Luck

Don Camilo hotel 50 euros. 

You can buy one in the uk to take with you at www.ctls.co.uk. They post it to your home.