Over the past three or four years I've had cause to go to quite a few Jerez F1 tests. Thanks to the likes of Stelios Haji-Ioannou and Michael O'Leary it's no great hardship, and not very expensive either.
I can hop a Squeezyjet from Liverpool to Malaga, jump in a hire car and be at Jerez in a little over two hours. The return is late night, giving you time to finish the day at Jerez and be back in the house a little after midnight.
If time's not an issue on the way out, continue down the Costa del Golf/Crime (delete as applicable) a little further and have a look at Sotogrande, Eddie Jordan's playground for the past 20 years or more.
Carry on as far as you can go and you get to Tarifa, which is windy as hell and now quite trendy and expensive as, naturally, it's caught on with the surfing/boarding crowd.