Found some at Autobits Farnham, at 11 Downing Street
(his name wasn't Brown) Farnham 01252 714993, bit expensive though small pot a bit bigger than a cotton reel for £4.15, but it will probably last me out. On the label it says "Penrite Water Pump Grease identical to the original specification 1930 - 1940's grease. Will not clog.Extends grease lubricators, particularily those used prior to the 1930's"