I'm with the small cct brigade and was taught the 2d model when I learned. Had a classic at Kemble a few weeks back. Downwind for 13 on a windy day and no. 2 in the cct I was desperately searching for no 1 who turned out (when I eventually spotted him/her) to be 3 or 4 miles out on final!!! Being a gent I extended down wind and followed and happily there was no-one behind me!