Thanks guys for the support & info
Some news from the company. I sent them a link to this thread & advised them of the many more to come! Low & behold, a reply!
"Hello Mr. ******
My college made yesterday morning an order by our transport company to pick up your item.
We had some discussion with the manufacturer and we are allowed to replace it or to give you the money back.
I hope that I have the tracking number for the replace delivery in the afternoon that you can track it and look for when they will arrive in your house.
Please also add your original invoice and a short letter whats wrong with the item.
Best regards"
This reply only came after I sent them the link, so it's a testament to the power of this forum
The transport company were in touch today to collect the old unit, but had no new one to deliver. I explained the situation to them & they agreed, given the hassle I'm having with the retailer, it would be maddness to give back the one I have without first receiving the replacement (I'd be left with no money, no PJ etc..)
So the current state of affairs is I'm awaiting delivery of a replacement unit, but they haven't e-mailed me a tracking number as they promised - no surprise there.
If it was dispatched earlier this week, I should have it by Friday, but I'm not holding my breath!
Regarding posting on that German forum, I have sent you a PM which explains things.
Thanks again for the support. Hopefully, my experiences, which will hopefully soon be rectified, will prevent some others from having similiar difficulties.
I'll keep you posted.
Long may this forum live - I thing we all have a very powerful tool at our disposal, as well as a wealth of useful contacts & information.