Some closure has been brought to the whole Green Card process. I finally got the permanent card in the mail today. Even though it was approved back in November it's still nice to get the card in my grubby hands at last.
So now (according to the blurb that came with the card) I can apply for American citizenship. I won't though as I never plan on giving up my British citizenship. I'm quite happy with the current nationality arrangement thankyou. If at some point in the future that changes then perhaps I'll look to see if obtaining dual nationality is a possibility. Until then I'll just be a Brit living in the States - with a permanent Green Card - which is always a bonus.