I am happy to report that Salisbury transmissions (Dean Spires) is alive and well in Harlow and is still able to rebuild Peerless and Warwick Diffs.
He has mine from Warwick #15 at the moment to sort out that annoying knock that's still in the transmission after I've replaced the crunchy "white box" UJ's.
The last one he did for me seems able to cope with 158BHP (reported) in Peerless #278.