Don't know from practice, but in principle, yes.
"Tagging" on the line relates to ADSL on the phone line rather then Cable, which obviously does not use the phone line.
What could be rather messy, is how you would swap over to run your network via a different modem (ADSL rather then Cable).
From your other post, you have a wirelessly connected laptop and a Belkin wireless router connected to NTL/Virgin's cable modem.
You will need to configure Orange's ADSL modem to act as a bridge and switch off all routing capability, to allow the Belkin wireless router to work. I did this over a year ago (in a different country, for a D-Link ADSL modem and Netgear wireless router). Successful but it was not as straight forward as it would be for an integrated ADSL Modem-wireless-router box.