Is it possible in a supply contract to insert a clause which says that unless you pay a fee or a charge you will not be able to supply your products to the producer. There is nothing to say that this is contractually unenforceable because it does not constitute a penalty nor is it necessarily caught by consumer legislation as unfair trading practices applies only to consumers. However, it does seem that small suppliers are caught in a situation from which they can not reasonably escape. Is this something that the UK Competition and Markets Authority should be looking at?