The Ford Focus is such a favourite of the British public that owners keep them on the road for as long as they can. This actually represents the most cost-effective way of running a car. If you are prepared to look after a reliable car like the Ford Focus then you will find that you extend its life expectancy and you will pay much less on repairs over time.
There is also the fact that you will not be compelled to buy another car further down the line because you want to discover a bit more in the way of reliability and quality. The Focus is lauded for its quality and this is something that it retains when it is treated properly.
You can buy a used Ford Focus that is only a couple of years old, treat it well, enjoy it for years and years and then you may even be able to sell it on for a good price at the end of your ownership when you give in to the lure of something more modern. Overall, you will have achieved a level of cost-effectiveness few people achieve.