One fact about the Decca/London pickups with which I’m sure @noromance agrees with me is that they are more critical of the tonearm onto which they are mounted than are just about all other designs. No cantilever, no mechanical damping, a very high level of mechanical energy transferred into the arm tube and bearings, models other than the Reference and Jubilee having a somewhat resonant body---which may be ameliorated by having the stock plastic mounting bracket replaced with the optional Decapod top plate. And the design suffers from a high frequency resonance, mitigated by electrical damping (varying amounts of capacitance and resistance so as to create a "tank circuit". You can read all about it in the writings of Decca enthusiast/expert Harvey Rosenberg of New York Audio Labs).
Once optimized in an appropriate and suitable arm, and amplified with an appropriate RIAA phono amp which can handle the pickups 5mv output (!), the Decca/London’s have an extremely alive, startlingly dynamic, somewhat "forward" (but also reproducing the depth in recordings as do few others) "robust" sound, producing music with great immediacy and presence. The "horn loudspeaker" of cartridges, if you will. Not for sissies ;-) .