I built this model as a kid, it was powered by a repro DC Merlin which left it a little under powered, especially given I seem to recall I extending the wings by a rib bay or two because I thought my RC gear was a little on the heavy side.
It flew well however and gave me many happy flights. Long since gone I’m afraid, in the same skip as the others!
Recently I bought a few issues of Radio Modeller, one of them happened to be the September 1985 issue, which was the issue where it was given away as a free plan. The free plan wasn’t included in the issue I bought, but I have scanned the article which is shown below. Click the images for a bigger version. If you want the full size scans click here and here.