I have managed to resolve mine. Not sure if it was a glitch with my end or zen, this is how I resolved it.

Selected Tools, Flexible Footer Menu
Click on the BLANK line under Share and Connect
Click Edit

Copy and paste the following into a texteditor like Notepad++
<a href="https://www.facebook.com/mineheadbutlins" target="_blank"><i class="fa fa-facebook"></i></a>
<a href="https://www.twitter.com/ardencaravans" target="_blank"><i class="fa fa-twitter"></i></a>
<a href="http://www.pinterest.com/holsclub" target="_blank"><i class="fa fa-pinterest"></i></a>
<a href="https://www.youtube.com/user/holsclub" target="_blank"><i class="fa fa-youtube"></i>
<a href="https://www.instagram.com/holsclub" target="_blank"><i class="fa fa-instagram"></i></a>

Copy and paste back into the Flexible Footer Menu Line by Line and click Update for each line.

On each update one more social icon reappeared with the correct code :) I am thinking when I intially edited the SHare and Connect field it placed in some control characters, not sure anywhere I am happy it now works.