2007 S40 1.6 rear brake pads rattling?

[zebedee]

This has been getting worse since having pads replaced and is now really noisy, thought it was heat shields as it is A metallic rattle, but been underneath and sorted them and it has made no difference. Driven same bumpy downhill road with brakes off (rattles like crazy) and with brakes on gently, absolutely quiet. So is this the pads? They are Borg & Beck BBP1943 but their website is useless so I have no idea if they are the right ones.