http://www.secretflying.com/posts/error-fare-business-class-flights-usa-london-uk-478-396/
OW, and from LAX
Being that it doesn't say business anyewhere, I'd say it's very,possible they reroute you...
You can probably cancel for free if they change flights
The site advertises 24 hour cancelation
Regardless the prices are not bad even in economy...