Hi and welcome,
have you tried all the sites reccomended by sam, the national pet register has lots of new posts on,ill keep a look out for you as i check most of them every day for my cat, shes been gone since aug 1st.my symps to you as its aufull on us and worse on the kids, mine cry at night for sally as she slept on their bed!
keep ur chin up and keep on top of the posters,try local dog walkers another thing i recently was told was to check with local vets as they always no of a "cat person "in the area who takes strays and injured in and may not be known to cat pro or rspca,it could be helpfull
welcome and take care+
Claire+