Find and Replace

Hi everyone.

Occasionally I make changes to one of my websites where I don't want to change every page one at a time, so I use 'Find and replace in Files'.

Here is where I have my problem:

I recently wanted to add

<div class="contacthours"><p>For enquiries between 10am and 8pm we will try to reply within a few hours.</p>

     </div>

to all of my pages. So I took the code:

Invertilt Road, Blair Atholl, PH18 5TE</p>

     </div>

     <br><br>

which is on every page, and replaced it with:

Invertilt Road, Blair Atholl, PH18 5TE</p>

     </div>

     <br><br>

      <div class="contacthours"><p>For enquiries between 10am and 8pm we will try to reply within a few hours.</p>

      </div>

But when I use 'Find and replace in files', nothing gets changed.

I'm sure this has worked in the past or am I doing something wrong?

I've tried this with all the pages open and closed