Hi mate,
I had 1200 grafts with Dr Reddy last October. I was charged ?7,500 pounds (I think your 12k estimate is plan wrong). At the time I actually didn't know how how this price was reached but I think their pricing is "per graft" not "per hair". In fairness they answered all my questions and are happy to see me and make time for me so I am sure they will be transparent with you too. I had my hairline dropped around an inch down and temple areas tightened up.
I hope if all goes well for you.
Best,
Nav.