Night Sky Astronomy

I hope someone can help me with this?

I was out at Mount Batten in Plymouth on the 8th January 2011 taking a look at the stars and sky when I noticed a light streaking across the sky. It was coming from a South Easterly direction, moving North Easterly, at a very fast rate. I could see it in the sky for a good 30 seconds until it got past the Moon and suddenly disappeared. I’m quite sure that it wasn’t a shooting star or a meteor as this seemed completely different, so i’m hoping someone knows what this may have been?

I did a bit of research afterwards and found that you can see the Mir Space Station in the sky on occasions and when the sun hits it, it looks like a bright light shooting across the sky. I’m not 100% convinced though.

Can anyone shed some light on this please?