Definately and english 1 pound coin from 2000, this year in famous for the number of fakes, the easiest way of telling is if the edge has lating rather than welsh, you's has welsh so it may not be fake and the strike seems to good to be a fake, but the edge is not aligned properly, but it is scratched a lot.
If you look on other sites you can see the different designs, they rotate every five years, a british pound, then scottish, welsh, northern irish and last english pound coins, we are on the english coin this year which hasn't circulated yet as far as I can see, these will appear around christmas time over here.
The Royal Mint reckons that 1.7% are fake, though as I have said I don't think yours is.