You can order the certs (to be posted to you) online from the Cheshire BMD etc ,but they are not available to view online.They cost £9 at the moment,due to go up on 1st April to £10.
Or get them from the official GRO site
http://www.gro.gov.uk/gro/content/certificates/ for £9-25,you will need the GRO references to order that way,try
http://freebmd.rootsweb.com/ for that.
Carol