Today's series of Spendors are quite different in my opinion, and admittedly I have not listened to any of them. However, Derek Hughes (son of SPENcer and DORothy Hughes) designed the Stirling Broadcast LS 3/6 and from all accounts has recreated the classic Spendor sound.
As a point of reference here are a few links that I have found useful:
http://www.regonaudio.com/The%20Spendor%20SP9%20Loudspeaker%20July%201996.pdf
http://www.regonaudio.com/SpendorSP12Loudspeakers.html
http://www.regonaudio.com/Spendor%20SP1.html
http://www.theabsolutesound.com/articles/stirling-broadcast-ls36/