I have booked a 3 night HB stay for three adults in a Spanish hotel.We will miss the breakfast on arrival, and have to leave before breakfast to return to the airport on departure. Am I entitled to 2 meals on our first day, lunch and evening meal?
I very much doubt you will get 2 meals when you arrive, it's more likely you will just get your evening meal, but you could ask when you check in.
I have known hotels to provide you with a packed lunch for your journey home though if you miss b-fast, or sometimes they will lay on a light continental b-fast very early in the hotel before you depart.