Hello my name is Alex and I will help you with this. Please note that I am a working Solicitor and may be on and offline as I have to attend Court and meet with clients, even at weekends. As such you may not get an instant response when you reply as this is not an ‘on demand’ live service, but rest assured I will be giving your question my immediate attention upon return.
Did you bite into it? Were you ill as a result please?
Potentially the manufacturer is liable because obviously the shop owner did not know there was anything wrong with it. Therefore you could sue the manufacturer for loss and damage. But given that you have been sick (I assume no time off work) then your damages would be minimal I imagine no more than £100.
But it would indeed be the Company that makes it that would be liable for any claim that you have. You would need to write and inform them enclosing the bar and then say you wish to make a claim.
If they refuse to pay you would need to issue proceedings in the County Court which you can do online at: www.moneyclaim.gov.uk or by completing form N1 http://hmctsformfinder.justice.gov.uk/courtfinder/forms/n001-eng.pdf and taking it to your local County Court.
Can I clarify anything for you at this stage? Alex