As from 1st October (until 31st December) BA are wetleasing Iberia Aircraft to cover the BA464 and BA 462 to MAD and their return flights for the short fall of aircraft and to provide "overall robustness". (whatever that means... it says it on the letter given out to passengers

Passengers travelling in Economy will have to pay for their drinks and meals, inline with the Iberia brand (as this would conflict the codeshare agreement)

Club passengers still get a complimentary meal and drinks.