The BBC said it was investigating whether there had been a breach of the rules.
The breach of the rules may not sound serious outside the Square Mile.
Involvement with this company is not, in itself, a breach of the rules.
A spokesman said the ads appeared to be in breach of the rules.
Some, however, may be inadvertently in breach of the rules because governors do not understand them, it adds.
"I view this as a serious, but technical breach of the rules," Mr. Collins said in the letter.
That this is a deliberate breach of the rules seems to bother no one, so we move on.
The parliamentary commissioner for standards is responsible for ensuring that any breach of the rules is properly investigated.
Mr. Lamy, however, said the organization would only act if there has been a "breach of the rules".
People who refuse to take part will lose four weeks' worth of benefit for their first breach of the rules and three months' worth for a second offence.
He does not suggest that the vets were aware that administration of the substance amounted to a breach of the rules.
