How not to get your Brooks saddles half inched

True, but i suppose (e.g.), a lugged track frame, which is already used on the road, not track, etc, etc, plus the fatigue of constant clamping-unclamping, will all in the end shorten the frames life, no? One of those frames seen at BLB was ....mine, bought used from the shop with a QR seatpost clamp, I was told all this at Roberts in Croydon, when I took the frame to be repaired. Mr. Roberts was actually the one telling me QR seatpost on a track bike was a bit silly and inadequate.

While I wholeheartedly agree with your sentiments regarding BLB, I am afraid you're mistaken in this instance. Steel isn't a material that develops stress fractures - it has no 'stress memory'.

Unlike aluminium, which can only endure a finite amount of abuse before it begins to develop faults, you can subject steel to the same force infinitely without compromising the structure of the material.

Basically, if a force doesn't break steel the first time, it will never break it. That being said, if you have the thumbs of Hercules, you might be able to crack a frame just by tightening a QR too much.

Mr. Roberts probably said they were inadequate because it's not often that you need to adjust the height of a saddle on a track bike.