Hi Gee
No - although this isn't legislation (yet) the Health and Safety Executive are encouraging good practice in improving healthy lifestyles. Not only is extended breastfeeding better for baby, it has health benefits for Mums too.
I think this link is okay to post
http://www.healthpromotionagency.org.uk/Resources/workwell/pdfs/Breastfeeding_Workwell.pdf - Susan please advise if you want me to take it down but it isn't a commercial site.
Although this is not legislation a company which denies a woman the facilities to continue breastfeeding on her return to work could possibly face a challenge under sex discrimination legislation.
AND just in case anyone is wondering ... no ... I'm not ... so no impending announcements! We had a circular at work about it just after this thread started

Cathy