Adrian,
Hybrid TV tuner for RNS-E is 8J0 919 148 C.
Last letter changes with each year, which means 8J0 919 148 without "C" will work too.
If you upgrade from RNS-D your tuner side 54pin connector will match. You will need to buy two FAKRA housings to convert antennas from your old tuner to new hybrid one: 4E0 035 672 K. It will cost about 3 pounds ftom Audi.
You will need to modify RNS-E side connector ftom legacy RNS-D connector to RNS-E connector. See this thread:
http://forum.a8parts.co.uk/showthread.php?t=2982