Hi Richard,
You are using the ancient version of the Fancy Product Slider module. The new version has been completely re-developed. I can't be sure why that image duplication happens. The image-reflection feature must have caused it. But I need to investigate your backend to say anything for sure.
Try this simple patch below. It will work for you (it will hide the duplicated image)
Open this CSS file:
www.honeybeefloralart.co.uk/modules/mod_vm_flexible_fancy_slider/media/css/themeBorder.css
Scroll to the bottom and and insert this line:
ul.FlexibleSliderPanel li > a { display: none; }
Regards.