Driving from UK to Dénia

https://www.viamichelin.com/web/Routes

Some people go west, some central, following the main E15 route, some avoid tolls, some pay up and take the quickest route regardless but Michelin are brilliant either way, just avoid Paris (although we kept to the E15 and passed Paris about 3 or 4 in the morning and had no problems)

We used Viamichelin when driving from Cherbourg to La Zenia, provides an excellent travel route with all service stations / rest areas and tolls shown.

https://www.viamichelin.com/

I drove few times to Spain and recently ( February, March) drove to and from Denia. Best, most economical route for me is keeping west (La mans, Bordeaux, San Sebastian).

If you are planning to sleep in the car overnight make sure you park up in well lit up place on the pay road service station.  This journey can be done easily in two days with one overnight stop. 

Hello everyone, in answer to your question as long as you drive sensibly and carefully there are a number of routes and options. We drive from Cardiff to Pkaya Flamenca 3 times s year. We've done channel tunnel and driven outskirts of Paris down,  ferries from Plymouth to Santander or Bilbao we've done both and even done the ferry to Caln... Driven right across France too. As Graham said always park up in well lit areas...even in air b&b   take all personal belongings in, passports, cash and valuables ..we've always been fine but know of others who have been burgled. Be careful at petrol stations yoo, theres been people approaching you at pumps to get a second person sneak in to car to steal from you. This happened to my brother. Anyway it's not that I'm trying to scare you just be vigilant.... and safe journey  when, eventually we are allowed to travel. We've driven from Santander to Playa Flamenca in 8 hours straight other than fir toilet breaks. Two of us sharing the driving.  👍👍🌞🌞🌞

If you're taking the west of France route, once you cross the Spanish border at Irun, take the mountain road to Pamplona. Decent road and toll free.

If it suits your schedule, I can recommend Bed4U Hotel just outside Tudela, south of Pamplona. Modern, comfortable, great breakfast, secure car park, near good restaurants for dinner and cheap fuel stations. From there take the N road to Zaragoza and then the motorway to Valencia and on to Alicante, no tolls all the way.

Do NOT sleep in motorway service station car parks. I have two neighbours who have been robbed in these places, one even thinks she and her dogs were gassed in their motorhome by the robbers. The other was a distraction robbery. Be very alert at motorway stops.

Many thanks everyone, some great advice in here.