That BBC logo was introduced in 1987 but not used on air regularly until 1990 and not in the channel logos till 1991.
But then things weren't consistent in the past, it's a relatively new concept.
The changes made to the BBC's copyright logo can be tracked all through one show that was on air long enough to see all the changes made in the 90s, One Foot in the Grave… starting with the first series that was produced in 1989 but shown in 1990, still using the old logo.
(click images for full size)
Then later in 1990 the new logo and font started being used. This lasted until the 1997 rebrand.
However from 1992/3 an additional, larger BBC logo was added to the end of programmes. Here are the main three designs for this show (the drop shadow on the logo on the first design varies literally episode by episode!)
In the 1997 rebrand, it was stipulated that the copyright text (© BBC XXXXX) would not use the BBC logo but spell out 'BBC' in Gill Sans, and the logo would only appear separately above it. (Unfortunately OFITG gained a separate producer and director from 1997 and so the BBC logo gets awkwardly positioned once again…)
Those titles were a good investment weren't they? Didn't even need to make any adjustments for widescreen…
If you want to see every endcap from every episode of OFITG and marvel at the minor differences in almost every episode then click here: https://imgur.com/a/4V9d3
EDIT: fixed wrong full-sized image link
Last edited by VMPhil on 3 August 2017 4:00pm