Oh I remember the blue bug.
Don't remember 88 but remember 90 and 92. 92 ran over a weekend but 90 was a Sunday into a bank holiday Monday IIRC.
Didn't TV-AM have offer their slot to the network at least once to avoid triggering a nationwide industrial dispute?
In 1988 TVam didn't contribute at all as it was during their industrial dispute and the technicians said they would boycott it if they did. They did contribute to the other two, but I remember in 1992 they had the local numbers on screen throughout their bit, so presumably it was just like any other contribution.
In 1988 and 1990 it was over the late May Bank Holiday weekend, from 7pm on Sunday to 10pm on Monday. In 1992 it ran over a weekend in July, from 7.30pm on Saturday to 11.30pm on Sunday.