This has nothing to do with Media Bias. No "media" is doing the film down. The only issue here is whether film distributors are prepared to pump their cash into anything they regard as "fringe" or "risky". And the only consideration they have is "bums on seats". If they though a musical comedy about Fred West would get people into the cinema then, if someone made it, they would distribute it.

The way to support independent films is to, well I hate to be obvious, get off your butt and go and watch it at a film festival or on its regional tour. Join its Bookface group, sign the petitions that are doing the rounds etc etc.

This is the way that all independent films get distribution, nothing unusual, no bias against "English Traditions", just simple economics and you fight it with economic arguments: support it, pay to see it, encourage others to do likewise.