The nearest airport is Reus which is 64km from L'Ampolla. Ryanair, in particular, fly directly to Reus from most UK airports and Easyjet, Bmibaby, Monarch etc. all fly to Barcelona El Prat which is 2 hours from L'Ampolla by car or train.
There are several car hire companies at the airport including Goldcar, Auriga Crown, Avis and Hertz, and it is easy to book these on-line from the UK.

As the apartment is centrally located just a few minutes walk from the station, it is also possible to enjoy a holiday without the need for car-hire.