Yeah, I think I get an extra half day a year. I forget, though, because I haven't been here a year, and we just got bought out and had all this stuff reshuffled.
In my experience, different companies handle it in different ways - one company I was with increased it by five days, but on your fifth anniversary with the company. I've also heard of companies giving one-off extra holidays for long service or other achievements.
If you're employed directly by a large company, your holiday situation is usually pretty good in the UK. If you're employed through an agency or you're a temporary worker, then it's usually pretty dire (compared to the UK norm - probably still quite good compared to the US).