the digital coaxial cable I can no longer source from my supplier.
The cable I have chosen to use for my Digital Interconnect going forward is manufactured by German Audio Company ViaBlue
and it is excellent.
Here are the details:
Without any compromises. Maximum speed. Error-free.
ViaBlue™ NF-75 RCA S/PDIF interconnects are coaxial high-end digital cables with ideal electrical values. They enable error-free and correct transmission of digital signals. With a base line requirement of a 75-Ohm surge impedance, a polyethylene foam dielectric and a silver-plated shield are further applied as technical refinements. This leads to extremely low resistance values and thus to maximum transmission speeds of digital electric signals. The ViaBlue™ silver shield, NF-75 interconnects have a 100% surface casing shield from electrical interference fields. The screen is composed of an aluminum foil sheath and a silver-plated braided sheath.

For experimental purposes I terminated this cable with Eichmann Silver Bullet Plugs and it sounds wonderful.
To buy 1.0m of this cable on Ebay.co.uk unterminated would cost you £18.90 (€23.00) inc. postage. The cheapest Eichmann Silver Bullets on Ebay.co.uk sell for £42.50 (€52.00) for a set of two so a DIY project would cost someone approx. €75.00 to make up themselves.
This cable will sell for £70.00 for a metre length so at today's exchange rate €85.00.
As this is a prototype cable and I used silver bullet plugs from another cable in it's construction, I will sell this to a forum member for €50.00 if anyone is insterested?