Was it not David Coleman Harty?
Don't think so, BBC and ITV did odds and evens on the England/Scotland years
Coleman did the 5-1 drubbing at Wembley in 1975 so 1976 would have been ITV, so that's why I'm pretty sure it was Hugh Johns. (used to work with a Jock who quoted it verbatim)
Having said that I can't remember what I had for tea on Tuesday...........