Two correspondence specials were published during the Volume 1 and 2 era of Madame, you can see their covers below.
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As the name suggests it was full of extra readers letters - presumably they had more material than they could use in the standard issues of Madame and felt it shouldn't have gone to waste.
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Both issues were A5 sized and 68 pages long. Unlike the issues of Madame at that time, artwork was used on the covers (both from Harry Fischer who's work was seen a lot in the SRA Publications family of magazines.)
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Madame Correspondence Special Volume 1
Madame Correspondence Special Volume 2
Later issues of Madame show adverts for another two Correspondence Specials, billed as Volume 1 & 2. These have different content from the two above and are from Madame's later years. Images below.
It's not entirely clear to me at this stage if these contain new material of whether it's a compendium of already published letters.
Madame Journal of Personal Correspondence Volume 1
Madame Journal of Personal Correspondence Volume 2
The Magnificent Madame Rosa was a homage to Madame Rosa who was frequently featured on the cover and inside the pages of Madame. She was a professional Dominatrix and active over quite a period of time.
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The Magnificent Madame Rosa
Miss Candida's Slave Training Manual was published in 1986 and is an A5 sized pamphlet (56 pages) that outlines her rules, sets tasks to complete etc.
Slaves Training Manual