As spotted By Bob VK2BIG who says:

Thought this might be worthy of dissemination.  A bottle in every ham shack, I wonder if they make a negative earth version?

Bob’s right of course, it’s of limited use to us without a negative earth version, perhaps a group buy may be in order?  In trying to track down a group buy price, I managed to find the following information on this product and matching Churchill Tool 18G548BS adapter tube and metering valve from a past auction:

These kits were supplied surreptitiously to Lucas factory technicians as a trouble-shooting and repair aid for the rectification of chronic electrical problems on a plethora of British cars.  The smoke is metered, through the fuse box, into the circuit which has released it’s original smoke until the leak is located and repaired.  The affected circuit is then rectified and the replacement smoke re-introduced.  An advantage over the cheap repro smoke kits currently available is the exceptionally rare Churchill metering valve and fuse box adapter.  It enables the intrepid and highly skilled British Car Technician to meter the precise amount of genuine Lucas smoke required by the circuit.

Unlike the cheap, far-eastern replacement DIY smoke offered by the “usual suppliers”, this kit includes a filter to ensure that all the smoke is of consistent size, It has been our experience in our shop that the reproduction Taiwanese smoke is often “lumpy”, which will cause excessive resistance in our finely-engineered British harnesses and components.  This is often the cause of failure in the repro electrical parts currently available, causing much consternation and misplaced cursing of the big three suppliers.

These kits have long been the secret weapon of the “Ultimate Authorities” in the trade, and this may be the last one available.  Be forewarned, though, that it is not applicable to any British vehicle built after the discontinuing of bullet connectors, so you Range Rover types are still on your own…

This Genuine Factory Authorized kit contains enough smoke to recharge the entire window circuit on a 420 Jaguar, and my dear friend and advisor George Wolf of British Auto Specialty assures me that he can replace ALL the smoke in a W&F Barrett All-Weather Invalid Car( 147 CC) with enough left over to test a whole box of Wind-Tone horns for escaped smoke.  How much more of an endorsement do you need?

More, you say?  Well, I once let the smoke out of the overdrive wiring on my friend Roger Hankey’s TR3B, and was able to drive over 200 miles home from The Roadster Factory Summer Party by carefully introducing smoke into the failed circuit WITHOUT even properly repairing the leak.  Another friend, Richard Stephenson, was able to repair the cooling fan circuit of his Series 1 E-type by merely replacing a fuse and injecting a small quantity of smoke back into the wires. So there!

The history page the above text is from also has a lengthy Q&A section addressing any questions you may have about this miraculous product.  Imagine the ham radio applications!  It’s nice to know that the bottle is easily refilled when emptied too:

Thanks Bob!