It might be worth going in to a Next and trying a few pairs, though. I bought some lovely patterned petite jeans recently, and they have become a fast favourite. It's hit and miss, I think, like everywhere on the high street these days. I do think their petite section has some decent offerings, albeit sporadically!
Could also try New Look - I'm not a fan, but they do offer petite jeans which get occasional rave reviews. Dotty P's, also.
You could also searching for regular sized crop jeans.
I used to always buy from New Look but they don't last long and I also found the Next quality has gone down too. I bought a lovely pair from Topshop which have kept their shape and look brand new even after 6 months of wear. They are skinny cut though but I'm sure they do other styles. I hope so anyway because I'm after some bootcuts.
I've recently found H&M to be great for jeans as you buy by waist size in inches and leg length, rather than size 8, 10, etc. The quality has been great too, lovely thick material with just a little bit of stretch and no baggy knees!