I've only ever bought one pair of clarkes and they were from brantano, I just don't like the styles and think they are a huge rip off (even more so since being told by Thomas' orthotic consultant that they are no better than any other sturdy shoe/trainer and they rip parents off).
I have had Thomas' feet measured in clarkes but didn't like any of the shoes so went elsewhere. There are loads of shops that measure feet, brantano, deichman, barratts etc so I usually go there then go to next and get their shoes.
xx