I am a size 12 5'6 and I was right at the front of the que when God handed out thighs so find getting a nice fitting pair of jeans a problem, due to my chunky thighs.
I also think French Connection Bootcut jeans are excellent.
Depending on how much you want to spend, you might want to have a look at Ted Baker jeans too, they are in the region of about �100, but they do look really nice on.
River Island (a much cheaper alternative) also do some good fitting bootcut jeans. But you really would have to try them on before buying as their sizes tend to vary a lot. Some jeans I can't even get over my knees and some are so loose they fall off... then some gape so much round the waste that when I sit down the whole world can see my bum *blushes*.
Good luck.