I've been feeling under the weather this weekend, and with a lack of things to do I got curious about the mysterious data services on 12303H on Astra 4.8°E -
BBC - CCI DAB
DAB D1
SDL NATL
As this transponder is an Arqiva one, and these services are the names of the UK's three national DAB multiplexes, I thought it might be safe to assume that these are the feeds that supply the transmitters across the country.
If this is the case, then my thoughts turned to whether it might be possible...
Arqiva National DAB Feeds on 4.8°E
BBC - CCI DAB
DAB D1
SDL NATL
As this transponder is an Arqiva one, and these services are the names of the UK's three national DAB multiplexes, I thought it might be safe to assume that these are the feeds that supply the transmitters across the country.

Arqiva National DAB Feeds on 4.8°E