Ok So I've had some issues with removing modules from Magento recently, so I decided to scrap what i had before and start again with a slight name change to the module.
So i created the module, set it into my site and it didn't work, Once I reloaded up the admin pages I only saw the logo, the global search, logged in, date, the logout options and the next grey bar, which usually contains the main navigation for the admin section, however it was devoid of any links... the content section was empty.
So I stuck it on my local test server and i got the same, however the empty nav bar now contained the following error:
Fatal error: Class 'Chris_Homebanner_Helper_Data' not found in C:\xampp\htdocs\magento\app\Mage.php on line 547
I finally installed a fresh copy of Magento on my local server, and it worked fine, all installed correctly.
So somehow along the road of building this site something has been done to break this. I've not changed or extended any of the Magento core however. The only thing I've really done recently is remove an entry from the core_resouce table and delete local module files for another module. So no idea how I could have caused an error like this by doing that.