L
Lucien Nunes
Generally yes, but lead fell out of use earlier. Where cost was the main consideration, TRS was cheaper than lead and increasingly found acceptance for domestic work. Where durability was the main consideration, VIR in conduit had always been and remained the system of choice. TRS was superseded by PE/PVC T+E, VIR singles by PVC singles. Lead sheaths kind-of fell through the gap in the middle for building installations, although continued to offer advantages for underground cables.
Lead twin was normally jointed using pressed metal JBs with screw-down clamping bars at the cable entries to connect the sheath to the box. At fittings such as roses and switch pattresses, continuity could be maintained and/or a connection could be picked up off the sheath using screw-on clips, or by pairs of flat bars that could be clamped around multiple cables. These were called 'bonding bars' because at that time 'bonding' meant maintaining earth continuity generally, rather than specifically connecting extraneous conductors to the equipotential. For ironclad fittings and switchgear there were saddle-type clamps that screwed into the conduit entries.
Because lead flows easily, these various clamping methods did not remain very tight. Although continuity was normally maintained, it was recognised as a weak spot and for high-class lead work even by the early '30s there was the option of lead twin with a bare tinned copper CPC inside, in contact with the sheath. This was terminated in the JB in the usual way offering a reliable CPC connection to both the sheath and the next point.
I have retained a good few meters for you. Message me so we can arrange postage 
