Totally unenforceable. Would love to see a test case on this soon so we can draw a line under it. Would love to see the judges face as BA try to argue their case. Maybe this would be the push the industry needs to sort out what is a ludicrous situation, including the more outrageous scenario of one ways costing more than a return on the same flight. Never mind dropping the last sector, I've often dropped the entire return portion (and got the taxes back on that!) 'cos it was cheaper than a one way fare.