Ah! I am now enlightened!
How did you know I had bathed the chain in oil? That's exactly what I did.
Who would have thought an air lock would be created in a chain link, eh - and me a plumber too, in my previous life.
As for the litre oil, it cost £4.95 for 50ml or £39.95 for a litre. With my envisaged usage of the oil, it was a no brainer to buy the 1 litre.
I will now put my sales technique to my limited cycling companions and EMPHASISE the benefits of Rohloff oil that can be purchased from my goodself without incurring any carriage costs. Sold to the man in the corner with a white stick and hearing aid.
Seriously Andre, thanks for the tip. It's amazing by what you learn from asking seemingly stupid questions or proffering one's own experience.
Aside, as a plumber, we often used to put Fairy Liquid into a noisy heating system - this would in turn quieten it down. When I went self employed, I rang Fernox - a very reputable manufacturer of central heating inhibitors - and asked how the Fiary Liquid worked. I was given the answer "NOT to put that stuff in. It makes the water wetter" What, it makes water wetter? Apparently it does, this inturn causes it to release more oxygen from the water, which in turn reacts on the steel radiators and in turn makes the water more aggressive which in turn causes magnetite (FeO2) iron oxide which in turn causes pump and boiler failure and, more commonly, pinholing in radiators. I learned this from being curious and asking what might have seemed a naïve question. Most importantly, it corrected the errors that I had been ignorantly taught.
So Mr Jute, thanks again for the input, Please don't stop to correct any of us and keep passing down that knowledge.
Ian