The OW (Oneworld) awards have been the "RTW" award product for the 8 OW airlines. It is mileage based and does not actually require going around the world (in fact it can even be a oneway award). The BA web site shows the award table for Y (J is double and F is triple miles). It might be in the secured part of the web site (signin required, so you must be a BAEC member, which of course is not easy on BA as you must fly a premium flight on BA before you are allowed to join).