Atco Standard 14" cross shaft bearings

Most decent bearing factors can supply what you need with a spherical outer race. Simply Bearings and Bearing Boys for example.

It's proving difficult.  I will let you know if I find some.

What you need is called a spherical ball bearing, I believe. The "spherical" refers to the outer shell. Simply Bearings, as wristpin suggests, has any number. These might not look exactly like the old ones but if the principal measurements (ie internal and external diameters and width etc) are the same they will work. 

I think I will go for a pair of imperial metal shielded pre - greased items. Should be able to retain the outer dust cover cap at the clutch end. (Just for looks..)    

These sound like self aligning bearings, often found on other machinery like combine harvesters etc. the outer shell is spherical though.