Much as I'd love to tell you and make you look even MORE of a fool I cannot. Its not helpful if people in my position are seen on forums like this.
But, even ignoring that.... What evidence do you have (the answer is "NONE") that they have an agreement NOT to stock the same items? You think that they do but thats not the same. TS might make a phone call and ask Scan/OCUK why they don't stock XYZ but all the companies need answer is that they don't want to stock that product and thats the end of it. There is no evidence that distributors are refusing to sell to either company. All there is here is the derided ramblings of someone who is irritated because he cannot find two sources of the same product so he can choose the cheaper one.
Maybe those two companies DONT WANT to compete - there is no law that says they HAVE to. The only laws are against price fixing (ie agreeing a price for an item) but if they choose not to compete.
Oh hell I am repeating myself becauses it so damn obvious.
And finally, the reason Scan never comment on this is that apart from the Raja's (owners) no-one else is authorised to discuss this and much as employees have told me on the phone how they'd love to post here when people post crap they are not allowed to.
My advice, WJA, "Quit while you're behind!!!"