I can just imagine the reaction in London, South East, South etc to Julian's accent. "Now on the ITV..." no, would never work.
It's not so much the accent per se, as ITV plc now do have some NI-accented announcers on the team. It's more the colloquial habits with wording (such as the superfluous use of the definite article in front of the station name) that would be absolute no-nos for ITV plc.
When there was that BBC/UTV simulcast to mark digital switchover, Julian of course pronounced the word "simulcast" such that the first syllable rhymed with "sigh" rather than with "him". Again, that sort of thing would go down like a lead balloon at ITV towers.
I is well eloquent, innit.