I think this is the page you're referring too:
https://www.netlawman.co.uk/ia/selling-goods-non-owner
Which in the introduction states: The basic rule of law is that you cannot sell what you do not own.
Now I'm not defending RadioGuy because I believe what he's doing is wrong on so many levels, but you can sell items that you do no own if you're acting as an agent for the owner.
What I thinks happening here is that you're confusing ownership with possession, RadioGuy has purchased the items from the factory (or agent) and therefore has ownership, but due to a shipping problem he doesn't have possession of the items and therefore cannot fulfill his orders. This is not illegal.
As far as none delivery, the sale of goods act does have regulations around delivery expectations -
The Regulations state that delivery must be made without undue delay and in any event within 30 calendar days of the day the contract is entered into UNLESS:
- A shorter or longer period has been agreed, or
- The obligation to deliver arises at the time it the contract was entered into, for example by reference to
information given to the consumer about delivery time (whether longer or shorter than 30 calendar days) before entering into the contract or otherwise having regard to the nature of the goods (e.g. postal supply of frozen products would have to be delivered in good condition an still frozen on arrival)
http://www.turbervilles.co.uk/blog/c...very-of-goods/