I have been to clobs n plods and they are OK. Our farrier knows someone who buys from them and says that the horses are good. The website is not a good advert for them. They are worth going having a look at.
They've bought from our stables before now, seem very nice. Have you read the testimonials? Try contacting to people from there, to see if the stories match up!
I know of someone who bought a pony from there and its a credit. Its 4 yr old and totally un flappable and not a plod. If you want a totally bombproof pony/horse, then they are well worth a visit but get it vetted.
Cobs aren't my cup of tea but a few friends of mine have had some crackers from them. The set-up doesn't look much but they do have some sound honest horses that do their job well.