I just checked Companies House again for David Harry Jewels and the nature of the business is listed there as:
"47990 - Other retail sale not in stores, stalls or markets "
So retail, not wholesale, not selling to other traders but selling to the public. Not selling via shops, stalls or markets." So, yes, it looks very, very much to me like Dave is selling his own stuff via Tatporia. That explains why is he often on for three hours a day and why Gemporia is putting up with jade, jade and more jade.
https://find-and-update.company-information.service.gov.uk/company/14427942
If Dave Troth is doing this, and he is effectively 'running solo' with his business without Gemporia buying all the materials, etc, then I would imagine he would have had to take out a hefty business loan to start out. Lets just say that each of his Jadeite stones cost just £1 each, he bought thousands and thousands of the bloody things.
That is one hell of a risk doing that, given the recent financial position of Gemporia. If Gemporia had gone bust, or were to go bust, as he's reliant on Gemporia as a sales outlet, it would have a devastating impact on his business too.
'Renting' schedule hours would be VERY expensive. I can't remember the exact figure I was given, but a very reliable source (Gemporia employee) once told me how much it costs to be on-air per minute - and it was a LOT of money. I can't remember the figure now so I'm not going to put a figure up for the sake of it because it would be wrong - but I remember being shocked. There are a lot of overheads - and, at the time I was told (around 6 or 7 years ago) the biggest overhead was the fees they pay for the channels that they broadcast on (hence why some channels, such as The Lounge / The Outlet & the Diamond Room, went online only).
My suspicion is more along the lines that Gemporia are buying the stones, metals, making the jewellery, etc - and DT gets a large percentage of each sale through commission. He can simply invoice Gemporia for his cut then - that way, he gets the benefits, without the risks.
The setting up of a Company could be for tax reasons. Rather than being just an employee of Gemporia and paying tax on his percentage through PAYE, setting up a Company allows him to invoice Gemporia for his percentage, and then he can pay himself a low wage at the basic tax rate and take bigger chunks in dividend payments. That reduces his tax payments perfectly legally and its quite common in the business world. It also allows him to claim for allowable expenses (driving to and from the studio and warehouse, office costs should he work from home, etc).
It's quite common with TV presenters, radio presenters, etc so that they can get around paying higher tax rates. Most of them have "registered companies" with a name like "Cilla Black Entertainment Ltd" (an example) - but in reality, they just invoice the production companies of whom they do work for, bank the money into their business account, pay themselves a small PAYE wage at the lowest tax rate via their company, pay themselves a nice big directors dividend once a year, and enjoy the perks of lower taxes as high earners.
I'm not saying that this
is what DT does - I'm saying that it's a possibility.
I'd be amazed if anyone set up a business and relied on Gemporia as their one and only sales outlet. If they go bust tomorrow, it effectively kills his business off too.