• fly from London (stantsed) to Alghero with ryanair.com (1.30 h by car from viaroma6 on a wonderfull panoramic coast road)
• fly from London (stantsed) to Cagliari with easyjet.com (2 h by car from viaroma6 by the high way)
• car rent with Hertz, Europcar etc…

Anyway with easyjet and ryanair you can come to Sardegna easily from differents countries. The roads are beautifull and very well kept and you'll need to have a car to visit all the beautifull beaches and culturals places around.