Please do not set yourselves up as barrack room lawyers!
As a former Trading Standards Officer let me put you straight:
1. It is not illegal to make and publish comparisons which are accurate.
2. It is not for someone accused of making misleading or false claims to provide verification of their claims, it is necessary for the prosecutor (a Trading Standards Officer) to prove the claims are misleading or false.
The latter may seem like pedantry but I assure you it is not and makes a significant difference. The "burden of proof" (as it is known in law) means that the investigator must do all the research and the accused need do nothing. Of course he could volunteer the evidence for his claims, if he is confident in it.
Roger in France.