This is from the DEFRA Website(but it doesn't really address our worries):~
The Breeding of Dogs Act 1973, The Breeding of Dogs Act 1991 and the Breeding and Sale of Dogs (Welfare) Act 1999
'Puppy Farms'
Anyone who is in the business of breeding and selling dogs will require a licence from the local authority under the 1973 Act as amended by the 1999 Act. The local authority has discretion whether to grant a licence and must ensure that the animals will be suitably accommodated, fed, exercised and protected from disease and fire. It is for local authorities, who have extensive powers to check on the standards of health, welfare and accommodation of the animals, to enforce the requirements of the Act.
The 1999 Act provides that bitches are not mated until they are at least one year old and that they give birth to no more than six litters in a lifetime and no more than one litter per year. Accurate breeding records must be maintained by the establishment for tighter controls on the sale of dogs by dealers and pet shop; for identification for traded dogs; and stiffer penalties, including imprisonment.
In addition, the Breeding of Dogs Act 1991 extended the powers of local authorities to obtain a warrant to enter any premises, excluding a private dwelling house, in which it is believed that a dog breeding business is being carried out. All outbuildings, garages and sheds are open to inspection. Previously local authority inspectors could enter and inspect only premises which were already licensed
and this is part of the Breeding of Dogs Act 1991.
Whilst it probably doesn't address the "Puppy Farm" issue directly,it might be of interest?
http://www.opsi.gov.uk/acts/acts1991/Ukpga_199 10064_en_1.htm