I return regularly to the UK for work purposes on Flybe and Ryanair, simply couldn't manage without their services. However, 'low-cost' is a bit questionable. The summer flights are often breathtakingly expensive because I'm usually compelled to book at short notice. Fortunately my clients pick up the travel bill.Now that budget and low cost airlines exist we spend our time tearing them to pieces.
Our guests use 'budget airlines/car hire' and 'driving themselves' about 50/50, hardly anybody goes the 'Eurostar/TGV/car hire' route although prices seem competitive and the few who have used the 'chuffer' have reported a pleasant journey and a reliable service (although there's a bit of hanging around in Paris). In general, guests coming for longer are more likely to drive their own car than fly - which is hardly surprising - and some are nervous about hiring a left-hand drive car.
Jim