Right, so i emailed about half a dozen bearing factors this morning in a hunt for these Nachi bearings for the Bridgeport mill quill. Only three came back to me, one said they will try to find them for me in the future.
Another local to me here in Dublin said they could get them in 2-3 days (i always take that with a pinch of salt), and quoted me a price of 140 euros+VAT, which i though reasonable.
But Kelly at Bearing Boys in Norfolk, came back to me with a quote of £89.91 for the pair plus £17.98 VAT, for a total of £107.89, plus the postage which i have yet to ask for, but i guesstimate at a tenner.
So very reasonable compared to the £300-£400 i assumed i had to pay to get this head back up to spec and in good order.
Pays to shop around, and thanks to all who helped.