UTV took Granada's Night Time service from 1988, which then yielded to the LNN feed in 1995. IIRC, the clean feed provided to STV/UTV came in at the time of the ITV1 rebrand in November 2004.
The only bomb scare which affected UTV I recall seeing on screen was in late 1992 - the programmes played out from their sources without adverts - I can't remember seeing a VT
clock in this instance, although I remember a programme menu being displayed during the slot for the late regional news. At the end of this slot, there was a brief switch to Border as their bulletin ended, then an ad break, with a UTV programme menu appearing at the end of the junction, with an announcement mentioning the security alert.
DE88, Richard and Si-Co gave kudos