There was also a brief NEW AVENGERS British TV series in 1976-1977.
Here's one of the two stories from the
NEW AVENGERS 1977 ANNUAL"Fangs For The Memory", a complete 8-page Bolton story. Nicely colored as well.
There's a second 6 page comics story by Bolton in that annual,
"Hypno-Twist", at this second blog that shows
both stories.
The full book also has text stories with Bolton illustrations.
There's a
NEW AVENGERS 1978 ANNUAL I don't have, that I don't know the contents of. I recall in my search it had Bolton illustrations, but not comics stories.