Sorry, I am late to the party.
Vesconite High Lube is what you need and is likely what has been supplied, because Highlube is normally used in marine apps, so I assume that is what Chatfields would be supplying. Most Bearing suppliers also stock it, so I would expect the Bearing suppliers down the end of the street should stock it KM. It's been around for a very long time.
It is a Thermopolymer plastic and is darn near a Miracle material. Very slippery on metals, with a Friction coefficient of just 0.1.
It is commonly used in Pumps as water tight bushes, because it can be run dry for a short period. It does not swell, thus can be machined to a tight tolerance and not lock up. It is happy in Salt water, which many plastics struggle with due to the many particles and minerals in Salt water. In fact it is happy in dirty water, which many other materials simply wear out in. It is also resistant to organic solvents, petrol, oils, Chemicals and acids and can handle Fluid temperatures of 100deg continuous.
It is also commonly used for stuffing box applications.
I find it wonderful to machine.