Thanks for the good advice guys, much more of the reality stuff that I was looking for.

I should have stated - I do indeed hold an EASA (UK) ATPL. Whilst the UK market is relatively buoyant, my quality of life and that of my family has been significantly eroded with base closures etc.

I have obviously misjudged the Green Card situation, so the reality check is much appreciated. I was under the (mistaken) impression that I needed to apply for a job and if successful, the respective airline would be my sponsor. Obviously not the case. I therefore wonder if at 44 that perhaps I've left it too late? I shall look into that side of things in more depth.

I really appreciate the honest replies guys. It's exactly what I needed.