Thanks BMC. Shame I've used up nearly all the SAE 30 I had (originally bought to oil my Myford 7 lathe) in the current engine, so won't be able to use it in the gearbox. I note that Comma also do 20W50 for older cars.
You can easily generate "mayo" by adding water to any miscible oil (like engineering cutting oil). I picked up on the anti Duckhams from some other posts.
As I've been running diesel engined cars since 1999, I've been using Castrol's Magnatec oil - they now don't make a separate one for Diesel engines, just one that supposedly is OK for Petrol and Diesel.
And talking of diesel engines - take a gander at this Series II 2 door ...[frame]

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Not mine, but I did buy the Gold Seal 803 engine that used to be in this vehicle.


'50 Low-light with 918 Side-valve engine,
'51 High-light with Side-valve 918 engine,
'55 4-dr with 803 engine,
'56 Traveller with 1098 engine.