From their site, it looks like once you get the batteries to the saft collection point @:
G&P BATTERIES
Mr Greg Clemenson
Crescent Works Industrial Park
Willenhall Road, Darlaston
UK-WS10 8JR
Tel : +44 121 568 3200
Fax : +44 121 568 3201
They take it from there.
The batteries then go to one of SAFT's recycling centers.
http://www.saftbatteries.com/TheSaftGro ... fault.aspx
Here's the EU directive on the disposal of spent batteries and accumulators.
http://europa.eu/legislation_summaries/environment/waste_management/l21202_en.htm
The producers have to bear the cost of collecting, treating and recycling industrial, automotive and portable batteries and accumulators, as well as the costs of campaigns to inform the public of these arrangements.