Yes it does! Petersboro I believe it was called (not Peterboro, as the original article said, and which was corrected in the 2nd part). This was the layout I spent ages watching with a school pal at the 1967/8 SSMRC exhibition in Brownsea Hall in South Shields. I remember it well, exactly as you described. The tunnel return was on the right hand of the 'L', the left hand was another station with out-and-back circular fiddle yard. An automatic half-barrier crossing was on the mainline, with the marshalling yard above the joint of the 'L', IYSWIM, complete with black foam carpet underlay groundcover. Next day, we dismantled my old triang layout, cut up the baseboard, and put the bits back together as an L-shaped attempt at a new layout, so on that basis it well merits its inspirational inclusion in this topic. It certainly revived my interest in the hobby.
Brownsea Hall was demolished some time ago, now housing.