@Silkiebunny
My experience is that (at least at the hospital I am at) they are strongly encouraging immediate reconstruction along with the mastectomy at the moment.
They really tried to persuade me, saying things like I am still young (I imagine they meant in comparison to a lot of, or possibly most BC patients, I'm not actually young), and pointing out other advantages.
I stuck to my decision to go flat though, because after suffering terribly throughout chemo I simply wasn't up to a longer operation and two areas of wounds. I was also having complete lymph node clearance anyway, plus there were also other stressful things in my life at the time.
They said I'm entitled to have a reconstruction in the future. Reading your experience, I think I'd have to book it in years in advance.
Your husband is French, do you have any way you could get it done there via French healthcare? I don't know the exact rules regarding how long you need to have been living there. I've lived in different countries, and often thought of them as a back up if the NHS get even worse because they don't have waiting lists, but of course we aren't resident or working there any more so it'd be complicated.
I'm just so sorry the NHS is letting you down so badly with this.