To: Ian
I do not believe there is a die cast model of the 407 being produced. There are die cast models of the 212, the 412, the A-109 Power and the Sea King. Corgi has a listing of models presently in production to include the B-47, Boeing CH-47 and many others.
There are a lot of firms in the UK that do high quality die casting of various models but in order to get them to commit to making a model you will have to provide a lot of dosh up front with a guarantee of a specific production run. You will also have to provide the necessary drawings and be prepared to pay a royalty to Bell.
I would suggest you contact a custom builder. I think I can provide the name of a quality builder. They presently have a 407 in OZ EMS colors but they can do any color scheme.