I hold a UK provisional drivers licence.
Will I still be able to hire a scooter in San Antonio, Ibiza?
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To drive a vehicle in Spain you need a valid driving license and if your license is not in Spanish or English an international drivers permit. To rent a vehicle you must be allowed to drive it.
A provisional license allows you to learn how to drive under restrictions. For example, you can only drive a car with an instructor next to you and you can not go on motorways. These restrictions show quite clearly this is not a valid drivers license and you can not use it to drive outside of the UK, let alone rent a vehicle.
See https://www.gov.uk/driving-lessons-learning-to-drive/overview for all the rules
Not knowing how UK provisional driver's liscense, you can rent a moped with the Spanish provisional Tourism vehicle (B-type) driving liscense.
you can always email this company ( the cheapest i've found) that have mopeds from 20€/day and ask them.