[Audio] shortcode does not work in IE?

Hi,

I have a number of pages that utitise the new [audio ...] shortcode in 3.6. This works ok in Firefox, Chrome and Safari but not in IE, not even IE10 !!!

I have tried different variations and searched for anyone else with the same issue but as yet not found the answer.

See http://dev.britishpolio.org.uk/polio-a-living-history/oral-history/interviews-11-20/

HELP

Thanks
Mark