Hi (Paul?)
That photo isn't mine (found it on t'internet!) so I can't do you a poster without breaking copyright, but give me a few days and I'll see if I can do something with yours.
It's a nice photo, if a bit small. Enlarging to A1 size without losing quality requires quite a large original. I've a few tricks up my sleeve though, and can maybe sort something. I'll post here again during the week. Watch this space!
Steve