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I have had helpful feedback from Arqiva's marketing manager, who confirms that the recent BBC1 reception issues are resolved. He further indicates :
"I have spoken with Digital UK and they have sent me the link below which takes you to a document on the Ofcom website. In section 7 the document lays out the terms for notifying viewers:
http://www.ofcom.org.uk/consult/condocs/transition/transition.pdf."