I first climbed this in the early 1970's when I was taken up on a trip from School. In the 1980's I was taking people up myself and I also solo'd the route at least twice. I have climbed the route 3 times in the last decade, the last time being in 2007. I agree with Simnel - my favourite lakeland diff as well.
Great easy routes...Giants Crawl is prob my favourite lakeland Diff.
I climbed Easy terrace and continuation/B-buttress upper tier/.One of the best of diffulcut scrambles in Lakes which can be done unroped/if you dare.../
Think we went up the Easy Terrace bit as you call it then straight up to the top. The guide book we used classed it as a 3S scramble, and yeah a rope is advised for that at times due to the steepness and abundant slippery grass surfaces. Not for the faint of heart, in fact, I probably wouldn't do it again! Haha :D