You might consider a LHR/MAN and then a MAN/AMS/MAN on CX. I am doing the AMS/MAN roundtrip in one morning on Y fare code ticket for $150.00. I live in the Netherlands and got my ticket through a Dutch agency named ATP. They are also on the web as www.atp.nl. Being a new transplant here, Iwas a bit leary until I visited their offices and talked with their personnel.