[Oldcodger]

Graham, you conjure up visions of open wire to house ( AKA Subs premises) , with insulators 16 ( from memory ) fitted on the house, to allow for the open wire to be joined to a flat copper wire leader to the "protector" ( with line fuses & carbon protectors, fitted with a protective earth) . Most dropwire in this era were copper coated cadmium or steel. But for those thinking of using what is known as "jelly crimps", I know from experience and old anecdotal evidence from old maintenance contacts that what happens with these is that the connection remains protected, but corrosion forms on the outer of the crimp and HR occur. Saying that I've come across many a Krone strip hidden in /under lead cladding where there's been no problems with damp.