I just noticed that Outta Sight is publishing a book written by Tim Brown on the 18th of October entitled
"The Wigan Casino Years: Northern Soul - The Essential Story 1973-81".
I haven't seen a mention of it on here yet, but here's the link to the website:
The preview pages looks promising.
below added by site
Northern Soul came of age in the mid-seventies. The first significant underground music scene in the UK came to the notice of the media and public alike in 1977, a television documentary endeavoured to capture the spirit of thousands of youngsters dancing all night to obscure, rare American soul records - which even then were up to a dozen years old. The Wigan Casino Years documents, illustrates and analyses the golden age of Northern Soul from 1973 - 1981.
Writer Tim Brown experienced those years as a top collector and later became a leading record dealer, label owner and documentor of this, perhaps the most idiosyncratic and secretly influential of musical formats. With high quality graphics and full colour throughout, this book confronts the modern age with the real truth and will fascinate both the devotee and curious at the same time.