Tnavas, I think you will find you are wrong on this one. I live in the UK, I hunt, I currently show hunters!
Not all TB's are light weight, or built for racing. I personaly know of a nice 16.2hh failed race horse who you would easily mistake for a fairly hefty WB. She is currently doing Para dressage!
I have to agree with this.
I watch races from the UK and other non N.A. Countries and the one thing I notice very sharply is that the Euro ( including UK ) TB seems to be a little stockier, more bone and shorter backed than the typical TB ( racing type) in NA.
Ours seem to have such long backs and look more like greyhounds than the typical ( racing ) TB over the pond.