In answer to many who asked what these flowers are -
I believe they are commonly known as Angel Trumpets.
Here is the description from Wikipedia.
The leaves are alternate, generally large, 10–30 cm long and 4–18 cm broad, with an entire or coarsely toothed margin, and are covered with fine hairs.
The name Angel's Trumpet refers to the large, very dramatic, pendulous trumpet-shaped flowers, 14–50 cm to 20 inches long and 10–35 cm across at the wide end. They are white, yellow, pink, orange or red, and have a delicate, attractive scent with light, lemony overtones, most noticeable in early evening. Flowers may be single or double.
All parts of Brugmansia plants contain dangerous levels of poison and may be fatal if ingested by humans or animals, including livestock and pets. Contact with the eyes can cause pupil diliation (mydriasis) or unequal pupil size (anisocoria). Some municipalities prohibit the purchase, sale, or cultivation of Brugmansia plants
We found them in the mountain area in the Costa Blanca growing behind a stone wall. As you can see, they were very large compared with my friends hand
none of us realised that they sare extremely poisonous – luckily no ill effects.
If you Google them you will see some stunning different coloured ones.