Taggart, STV’s perennial cop show, returned to our screens a few weeks ago. For those who’ve never seen it, Taggart endures as a popular example of the crime procedural, despite its spell-it-out dialogue and declamatory acting. To promote this latest outing the show’s legendary strapline – there’s been a murder – features in an ambitious trailer displaying jaundiced shots of Glasgow where police tape spans every corner and crevice; the entire city posing as crimescene. Even the local branch…