[WillPS]

It was definitely Monday 5 October 1998,  on the Sunday we still had the IT\= logo and the following day we had the blue and yellow lower case logo. By this time whilst there were no generic idents, the vast majority of promos in between programmes were network ones, and the change was very noticeable. (As would have been the case on Granada, Carlton and UNM regions) The Production for IT\= end caps were dropped immediately from this date.

There was a generic ident, although by this time the only place you'd see it was Grampian and possibly Border.

EDIT: and of course the night time one, which persisted for a few extra nights/weeks overnight.