Mark,
Bait & Switch is illegal full stop.
These guy do actually clean carpets, albeit not very well as they are not trained. They receive training from there own technicians who received training from the technicians before them etc.
As far as I'm aware no-one in the company has any proper training.
The way their bait & switch works is when they arrive at the property they will put some detergent in the machine and do a sq ft.
Then they will do a pre-spray, agitate and rinse. Obviously the second one looks better, so they then try to sell the second, more thorough clean. So although it is bait & switch, they will actually clean a carpet with an in tank detergent if the client absolutely insists.
This is how they manage to get away with it. As far as trading standards are concerned if they are willing to clean for the agreed price then they would be very hard pushed to get any kind of conviction.
Fran.