Sidelock or boxlock failure in a hurry will not help, thus you have a PH as backup for such a contingency. Different is if you can replace a brocken lock to continue your safari. Then makes sense that WR offers detachable lock guns plus a set of extra locks, putting this kit in equal footing to a sidelock with detachable locks (plus extra lockplates). Giving equal reliability to both systems, still a new WR droplock + extra locks (50.000) is more cost/efficient than a new London best sidelock. Same should apply to second hand guns of similar condition and age.
EJSXS
