From what I can tell, the Ladies class began in 1992 and still continues.
There's even a Ladies spring class since 2012.
Here's the best resource I've found r.e. the Worlds over the years: http://www.freewebs.com/nftac/wftfhallofchampions.htm
on the Norway site.
Would be nice if the BFTA site had some history and photos on there!
For those who know me - this is Phil from Monmouth
... For them that don't know me, I'm still Phil from Monmouth to be honest.