WHATS MY TARGET?

I was asked today what my target weight was, a quick think later and i decided anything under 13 stone would be ok, then I thought id check on the NHS website, it says that for my height 5'7+1/2" i should weigh between 8 1/2 stone and 11 1/2 stone, well I'm an endomorph which means i have a stocky frame with stronger thicker heavier bones than someone who is a long distance runner so i reckon I'm going to be a bit over the 11.5 stone guideline the NHS has me down for.
my BMI has dropped to 30.9 from 34 back in mid July i think that's good going, so the target now for a good BMI of 24.9 is a weight of 11 stone 7 lbs, Jesus i think that's going to be tough going, are the NHS correct with their figures???

I've been to physiotherapy this morning, i woke up and my leg felt quite ok, not right but better, so i decided to walk to the infirmary, bit of a mistake that as i nearly didn't make it, walking up Winnington hill was excruciatingly painful, this was then explained to me by the physio as walking up hill was using the muscles that are inflaming my problem.
my problem is a partially torn Achilles tendon, this was probably done over 2 years ago when i did the Malta half marathon. id felt my calf go after 15 minutes and carried on for another 2 1/4 hours to finish the 13.1 mile race, what an idiot!!! 
anyway I've been given stretches and exercises to do twice daily, bad news is i hoped id be able to run once everything was sorted out but it appears that is not the best thing to be doing once you've had a tear, but the good news is i can cycle so i maybe becoming a bit more focused on doing that as best i can, although I've been told not to cycle out of the saddle, could make it difficult going up some hills. 

think this but further up towards the calf muscle(partial tear)