That's the one I have. Just thought I'd check it to make sure it was OK........
And........
It works perfectly.........
And yes, it's the 1amp one.
Didn't even know there was a bigger one. When I bought it I just searched for 12V mains adapter and this one came up.
But I do agree, £5 for the bigger one is worth it. If I knew that in the beggining I would have bought that one.