[James2001]

Just in case you weren't asking rhetorically, the standard credits template was introduced to allow for End Credits Promotions (ECPs) that pushed back/squeezed the credits and allowed other programmes to be promoted - complete with text/graphics (sometimes video) - by the continuity announcer.

Can't see why they couldn't at least allow a show to use their own font and background though, like the BBC and Channel 4 do (and even Channel 5 shows use their own font and scrolling even if the background is black). The ITV font and black background (and the various blue ones beforehand... but at least that was more interesting than black, and some shows were able to use their own backgrounds in those eras) look horribly bland, and obviously makes every show look the same. ITV's credits really stick out like a sore thumb against every other UK broadcaster who at least allow some individuality.