Search with Views not Saving Selected Filters when user tries to go BACK
Ok, I solved my own question. To get Views search results to 'stick' you just have to select an option for each filter you want to save and the role that this works for.

In Views > Filters > check the box next to 'remember the last selection' and select which roles this applies to.

Easy. Now when a user clicks the 'back' button I've added to the tpl file it takes them back to their selections.