I would pop HDFury an email (click the email icon within the about us section on every page) as I'm sure they will have what you are looking for
If you have a look at the manual on your TV, you may also find it outputs an optical PCM format (although this might just be PCM/Stereo) via its optical connection when connecting any HDMI device to it
What device are you hoping to get the product to work with?
So, it looks like you need to go a little old school here in order to make things work.
What is the pre-amp and I'm guessing you've updated something which is causing a new issue for you (is that correct)?
How many sources are you trying to connect?
If its the likes of Sky/Virgin/Terrestrial broadcasters receivers, then most of these devices have optical outputs and you can usually using the optical output via those devices whilst still using the HDMI cable to the TV. If its a Blu-ray players, again many of these work in the same way to allowing the audio to pass via the optical connection whilst still using the HDMI cables for the visual side
That's unusual for a Blu-ray player not to have both outputs (I'm only aware of a few which don't). Although its a little late in the day (as you already own the Blu-ray player) looking in the classifieds or adding a "wanted post" as most have both features. Have you replaced your existing player for streaming usage and if so, it still might be your best option depending upon what you wish to using if for
Yeah, it looks like quite a few of the base line models have had this feature removed sadly. I'd say that if you cannot find something cheap on Amazon or these forums (add something in the classifieds as someone may have an older HDFury type product knocking around which they don't use) as it will most likely cost more than the player meaning it'll be more worthwhile letting the one you have go and jumping to a model which has the required connections you need
Although I cannot comment on what Argos have said and whether you take it further with them or not, but the options you have are limited to what I have mentioned before, so maybe add something on these forums within the classified section to see if anyone has an older unit going spare for not many pennies