The law is clear. It says that the item must be sold without faults, and the guarantee has to cover as long as a reasonable, impartial person would expect the item to last.
So if you are selling a windmill intended to be stuck in a seaside sandcastle, that would not be long at all. But for an electronic device with no moving parts, it would be several years.
If you honestly believe that a reasonable, impartial person would think that a digital camera costing the best part of £100 should only last a month before wearing out, I find it hard to agree with you.
I suggest you start by reading
http://sogahub.tradingstandards.gov.uk/sites/default/files/SOGA_explained.pdf
or
http://www.adviceguide.org.uk/wales...s_-_if_you_want_a_repair_or_a_replacement.htm
or
http://www.theguardian.com/money/2011/feb/05/how-long-electrical-goods-guaranteed
But you may be wise to contact Trading Standards. In my experience, they are usually very helpful, though none of our ecommerce clients are based in Stockport, and it can vary from town to town how helpful they are.