I have nothing to add...I have a 33 inside leg, being 5'11" and I used to have terrible trouble buying trousers
It was usually M&S, which as stated are often a bad fit at the crotch, or LTS which are often poor value for money imo. You can get some great stuff from them, but you have to be careful with the fabrics...and many of them are man made/unwearable/horrible after they've been washed once!
Dorothy Perkins started to have a tall range, but I haven't been in for yonks. It was my store of choice for a while being cheap and cheery enough for me to go in.
I have found some supermarket brands going into the longer leg lately though(Sainsbury's for example) and have managed to get a pair of evening trousers from there which were a reasonable fit.
Next are always a good choice too, though it's the outlet stores for me more often than not and the long can be just right, too long or not long enough, depending on the time of day, the relationship of the moon with the sun, the length of my shadows.....??!!
It's good to see some of the other stores that provide for us tallies... It's better than it used to be, but I'm sure it wouldn't kill a lot of these places to do more. And why do they think we're all tall and thin?? A size 16 seems to be deviant with the longer lengths, but I'm sure a lot of us are well covered and therefore a larger size than our more vertically challenged friends.