"What evidence do YOU have that other political parties need to conduct such inquiries?"
If a major party is publicly accused of racism or bigotry by a community leader it is not only beholden on that party to either disprove that accusation or carry out an enquiry - that responsibility is magnified 100 times if the party in question is the one governing Britain.
It is in their own interests to do so - unless the accusations are grounded in fact, of course.
Jim Carroll