Hi kaya.
Sorry you have been left unanswered for so long. I haven't been using minimins regularly for a while but I have recently started back on my diet and so here I am (couldn't get through it without my support network here)!
Anyway, NHS tummy tucks...
It's hard to answer about criteria since each and every PCT is different. However, the main similarity being that you usually need to have dropped down so many points on the BMI scale to a certain BMI (some state you need to be BMI 27 and some state BMI 25). Also, some say you need to have maintained this drop for 6 months and some say for 2 years.
Do you see where I am going with this? It's a bit of a postcode lottery unfortunately. You might be able to find your PCT's criteria on Google in the form of a PDF document.
My GP is in West Norfolk but she didn't refer me to West Norfolk PCT to ask for funding because she felt it would be unlikely they'd fund me. She referred me to Addenbrookes Hospital in Cambridge (which is my nearest NHS hospital that does plastics) and the plastic surgeon that did my op was the one that checked me out and gave me the go ahead. He has a certain amount of funding available for NHS tucks every year and he makes the decisions.
Maybe other areas have this sort of set up too, but I have no idea. My experience seemed quite different to a lot of other people from different areas that I've chatted to though.
Hope this all helps, hun and good luck. Keep us posted!
PP
xx