Jimbob - I bet Eternal haven't stopped supplying Estates, its likely they are just currently out of stock. They are normally unable to tell you when stock is arriving.
I have an Eternal on the MV6, coming up to 2 years old, absolutely delighted with it for the money. The number of Omegas that turn up here, and to meets, with droning exhausts due to the tat that the likes of Timex/Walker churn out.... ....and I couldn't live with that drone, its tiring and nausiating.
The Eternal ones, IME, are every bit as good/better than the current GM ones. And at around £120 delivered, is a no brainer.
If you can patch yours up until Eternal get in the ones you want (normally 2 or 3 week wait max IME), I don't think you'll regret it. Hellfrauds do some great shite for bodging exhausts, as I'm sure tunnie will confirm (as long as its not the pipe coming adrift from the boxes). If you need the details, I'll go to garage to check what it is...