Hi, Kelly. When I first moved here, I bought a '93 Rover Metro (automatic) for about £700. I'll admit right now that I know very little about cars, so please bear that in mind! I found a serious shortage of second-hand automatics, so was very lucky to find anything at all! It seems like automatics are used primarily by older people (or that's their reputation) -- and the Metro is sort of seen as an older person's car. Personally, I've never cared too much about image when it comes to cars -- as long as my car gets me from Point A to Point B, I'm happy. But if it's important to you, you might not want a Metro!
As I said, I know very little about cars, but took my uncle along with me. He does know a lot (used to be a mechanic) and he examined the car pretty thoroughly and decided it was a good deal. I think one of the main criteria was rust. With older cars, you tend to get a lot of rust, and that's something that will prevent you from getting a new MOT (without doing welding, etc. to fix it). The good thing about the Metro is that as it's often owned by older folks, they often don't have too much mileage on them and generally have not been abused too badly.
I kept my Metro for 2 years, but in the end found it too small and uncomfortable for long-distance driving. I will say, though, that as a new UK driver, it was ideal for tooling around country lanes and maneuvering roundabouts, etc. Driving here does take a bit of getting used to, and a small car was perfect for that.
I now have a Neon (ugh!), which is only a couple of years old and cost substantially more than the Metro. Again, I bought it because it was the only second-hand automatic I could find that was the right condition and price.