On the YouTube 

Here is Alan Crossley speaking a couple of years before his death, he knew more than most about physical mediumship and its history.These videos are about the famous Helen Duncan, a plain modest woman who was a very wonderful deep trance medium.
 
Part 1  Helen Duncan and her part in the security scares of WW II which caused her to be imprisoned. She never made any money from her gift. 

Alan met her in 1947 and comments on her inability to talk in her own defense in court regarding her gift of trance mediumship, for the obvious reason that she was in trance!

http://www.youtube.com/watch?v=ZuEBASIrDGk
 
Part 2 Anecdotes about Helen's healing, 

She was frightened of the whole mediumship thing!

Ectoplasm is no longer needed, say the spirit world - it was very dangerous!

 http://www.youtube.com/watch?v=8RLQ_AyU-Pk
 
Part 3

The Mayer of Dewsbury's wife saw him materialise in a seance with Helen Duncan.

 
http://www.youtube.com/watch?v=n0hnbLxcTbU
 
Part 4

Alan's own wife materialised to him. He was speechless, but his wife wasn't!

His book is written to vindicate Helen Duncan - it took 24 years to write, and had also at this time, stayed in print for 24 years.

The Church of England Report

the Arch bishop of Canterbury's findings were in favour of co-operating with spiritualism in 1937 but they suppressed the report because they worried that the public would not support the idea, then when it was published they said that greater cooperation would benefit all.  

http://www.youtube.com/watch?v=-C5gPNbXQzw

 About  Ectoplasm - wax impressions made by scientists. Cut and paste this last one.

http://www.youtube.com/watch?v=GJI6NX51Ka8&feature=related

And many more on the site....