Hello
There is already 2 module positions in the header area of the London template (header-1 and header-2). Just to confirm, you wish to add 2 more?
If so then add the code for a new module position directly after the following in your templates index.php (../templates/j51_london/index.php - line 47)...
<div id="container_header">
<div id="header">
<?php require("inc/layouts/social_icons.php"); ?>
<div class="wrapper960">
CiarĂ¡n