Yes - clarks will cost you around 25 - 35 pounds in UK, so they are cheaper. But why by Clarks in UK when you could get Startrite? IMHO, a much superior longer lasting brand. They will cost in the region of 30 - 38 pounds and are available in London stores of Trotters and John Lewis on Oxford street also. Their website tells you sockists.
In my experience the heat here makes Clarks uppers seperate from the soles after a while, especially for boys who play soccer in their breaktime. In the UK there is good customer service so you could take them back, but again from my experience here, they are not so willing to do that.
Do startrite do black trainers with velcro?
However Startrite use stitching so the shoe is less likely to come apart. Also UK is cheaper for Geox, Ecco as well as others. Remember to take a pencil outline of each of your child's feet for correct sizing.