Find my Past seem to be adding a lot of Leicestershire newspaper articles at the moment. They have recently added the Mercury to the site (joining the Chronicle), and in just the last week or so I have seen an increase in the number of articles from these two, especially the Mercury, online. So if it is not on there yet, it may well be soon.
The Record Office in Wigston has all the old Leicester papers available on microfilm but you have to go through them page by page until you find what you want.