Free Will Baptists are not exactly mainstream Christians. This was in the article the OP cited - the last paragraph. The person quoted is the Executive Secretary of the sect:

"It's been a non-issue with us," Burden said, adding that many interracial couples attend Free Will Baptist churches. He said the Pike County church acted on its own. Burden said the association can move to strip the local church of its affiliation with the national denomination if it's not resolved.

A slow news day in the UK, eh?