I was looking at contemporary arms for the current London’s a while back. Robert Levi at Positive Feedback has his Reference mounted on a Helius Omega Silver Ruby---a great arm, but over five grand retail. The Kuzma arms look up to the job (stiff arm tubes, great bearings), even the relatively-modestly priced ($3200) Stogi Ref. As dover said, the old Zeta has long been considered a great match, but they don’t come up for sale very often---their owners tend to keep them!
Though damped uni-pivots were recommended for the old Decca’s, none of them have as stiff an arm tube as I like to see (as has been said, the Decca/London design pumps a LOT of energy into the arm). And the current London’s don’t necessarily require damping to the degree the Decca’s did.