The quickest way to get to Vera Natura is to fly to Almeria airport, where you can hire a car.
At your arrival it will be also possible to be transferred from the airport to Vera Playa and returned at the end of your stay (look at Shuttledirect).
Alicante airport is an alternative.
There are more frequent flights to Alicante, which is about 200 km (125 miles) from Vera Natura.
If time allows, you could drive from Calais to Vera - about 2000 km (1250 miles).