Hi MrT, sorry if it wasn't clear, this is not a specific template issue but rather an issue in the Gantry template manager (can't link you because it's the administration area). It affects all templates and you should be able to replicate it by freshly launching Joomla and a Gantry template.
The tabs do not respond and the content also becomes distorted pushing the page down.
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Many thanks again for your help.