If you're unsure as to whether you may have one of their faulty cases, send them an e-mail with details of the date of purchase and the supplier.Tim Turnbull the Chief Executive of Aquapac International Limited, London contributed to the Forum thread below to say anyone could e-mail him about this tim@aquapac.net
If they believe your case might be affected, they'll send a postage-paid envelope to return the case for checking. There's a Forum discussion of this here.
Damn good customer service I say.