Antony, if you are interested in eliminating an unnecessary <div> layer in your menu, please do the following:

Make a backup of the c5dmenu.php file.

Copy this code into a new c5dmenu.php file. (Please keep the indents exactly.)

Test the new c5dmenu.php file throughout your site.

This revision removes one apparently unnecessary <div> layer outside of the #navcontainer and closes the hole where the flyout menu was. It also adds the id "header" to the logo container. This revision does not affect the performance or validation of your site. It just tidys up the menu file a little.

I hope you will try it, but if not, it's no biggie at all.

Cheers!


c5dmenu.php

Code:
        <div id="header">
            <img src="http://www.c5d.co.uk/c5dbackground.png" alt="c5dlogo" width="950" height="115">
        </div>
        <div id="navcontainer">
            <ul id="nav" class="menu">
                <li><a href="http://www.c5d.co.uk/homepage.php"><img src="http://www.c5d.co.uk/home.gif" alt ="home" /></a></li>
                <li><a href="http://www.c5d.co.uk/homepage.php">Eng &amp; Wales</a>
                    <ul class="sub-menu">
                        <li><a href="http://www.c5d.co.uk/homepage.php">England &amp; Wales Certificates</a></li>
                        <li><a href="http://www.c5d.co.uk/groups.php">Family Groups</a></li>
                        <li><a href="http://www.c5d.co.uk/research.php">Research Service</a></li>
                        <li><a href="http://www.c5d.co.uk/ninthfield.php">Large Orders</a></li>
                    </ul>
                </li>
                <li><a href="http://www.c5d.co.uk/scotland.php">Scotland</a>
                    <ul class="sub-menu">
                        <li><a href="http://www.c5d.co.uk/scotland.php">Scottish Certificates</a></li>
                        <li><a href="https://secure.jotformeu.com/form/20562318766356">Scottish Order Form</a></li>
                    </ul>
                </li>
                <li><a href="http://www.c5d.co.uk/northernireland.php">N.Ireland</a>
                    <ul class="sub-menu">
                        <li><a href="http://www.c5d.co.uk/northernireland.php">Northern Irish Certificates</a></li>
                        <li><a href="https://secure.jotformeu.com/form/20562335218347">Northern Ireland Order Form</a></li>
                    </ul>
                </li>
                <li><a href="http://www.c5d.co.uk/roi.php">Eire</a>
                    <ul class="sub-menu">
                        <li><a href="http://www.c5d.co.uk/roi.php">Irish Certificates</a></li>
                        <li><a href="http://form.jotformeu.com/form/20560737900349">Irish Certificate Order Form</a></li>
                    </ul>
                </li>
                <li><a href="http://www.c5d.co.uk/parishrecords.php">P R Es</a>
                    <ul class="sub-menu">
                        <li><a href="http://www.c5d.co.uk/parishrecords.php">Parish Register Entries</a></li>
                        <li><a href="https://secure.jotformeu.com/form/20563263008345">Parish Register Order Form</a></li>
                    </ul>
                </li>
                <li><a href="http://www.c5d.co.uk/censusentries.php">Censuses</a>
                    <ul class="sub-menu">
                        <li><a href="http://www.c5d.co.uk/censusentries.php">Census Entry Copies</a></li>
                        <li><a href="https://secure.jotformeu.com/form/20563312173343">Census Order Form</a></li>
                    </ul>
                </li>
                <li><a href="http://www.c5d.co.uk/sterlingpayments.php">Payments in </a>
                    <ul class="sub-menu">
                        <li><a href="http://www.c5d.co.uk/sterlingpayments.php">Make Payments in </a></li>
                    <li><a href="https://secure.jotformeu.com/form/20562220135338">Order Form</a></li></ul>
                </li>
                <li><a href="http://www.c5d.co.uk/nzcerts.php">NZ</a>
                    <ul class="sub-menu">
                        <li><a href="http://www.c5d.co.uk/nzcerts.php">New Zealand Certificates</a></li>
                        <li><a href="http://www.c5d.co.uk/nzcerts.php">Order Form</a></li>
                    </ul>
                </li>
                <li><a href="http://www.c5d.co.uk/probates.php">Probates</a>
                    <ul class="sub-menu">
                        <li><a href="http://www.c5d.co.uk/probates.php">Probates, Wills &amp; Admons</a></li>
                        <li><a href="http://www.c5d.co.uk/pre1858.php">Pre 1858 Probates</a></li>
                        <li><a href="https://secure.jotform.com/form/20393244360"> Probate Order Form</a></li>
                    </ul>
                </li>
            </ul>
        </div>