Think you'll find that the Defence Travel Modernisation Project has already advised that Business Class travel be abandoned. This was suggested and agreed to by the DMB earlier this year and associated "savings", (some £10m), made against the various TLBs RCTs. Note however that policy has not been changed (aka agreed and enshrined by SP(Pol) and CM(Pol)) instead "guidance" issued from 2nd PUS/VCDS.