[Asxer544]

The underlined BBC logo first appeared in 1987, but didn't start regularly appearing on copyright straps until 1990 (though there's a handful of earlier examples, especially from Pebble Mill programmes), but the 1972 rounded logo still appeared on some programmes as late as 1993 (and I've seen it on publicity photos from even later).

Actually and officially (according to most sources), the underlined BBC logo was launched in May 1988, and making the appearance on some programmes in the same year and news programmes in 1989.