St Michael china England-2586
Where and what year was this china made?
"St. Michael" in this case was a trademark (since 1928) of British retailer "Marks & Spencer" and many items made for them came from all over the place and were merely marked with the brand name (until it was discontinued in 2000). I know that the few Wedgwood items made for them were additionally marked as such but otherwise the items are all non-manufacturer marked, meaning that it could have been any ceramics manufacturer in England.
Other than perhaps trying to ask over on the eBay.com.uk porcelain-/-glass board you would have to perhaps find a collector/expert on British retail store ware. You are still luckier than you would think as other people owning retail store ware (e.g. from Woolworth's) don't even know what they have as many of their dictated marks are either not shown or only rated "unidentified" in various reference books.
At least you know where to look
This response is rather different from another to a similar question on your site. That quotes a Clyde pettery from 1890s! Do you want to moderate the other answer or revise this one?!
The St Michael Logo on the St Michal China in question bears no resemblance to the St Michael logo that has become so famous as the M&S brand. I believe that St Michael China was made in the late 1800's by Clyde. If anyone knows anything about this manufacturer I would be very interested to hear it.
Marks and Spencer have never used this trademark.
The China was probably made in LONGTON.
Since this china is stamped made in england it is unlikely that it was made in a clyde pottery. That was mis-information which I am sorry for.
In Encyclopaedia of British pottery - by Geoffrey A. Godden FRSA, it refers to CLYDE POTTERY CO> (LTD). Est 1815 - 1903
For further Information see -- J. Arnold Fleming's Scottish Pottery.
Here the trail ends as I do not have acces to Flemings book.
Hope this helps.