Hi Mark,
Do you mean that MEF is Managed Extensibility Framework? If yes, I didn't use this framework. Let us discuss WCF development issue here. We can't give you much help about MEF development here.
You can have a look at self-host to host one WCF service in runtime to implement your requirement. To be able to self-host your services, you have to meet two requirements. First, you need the WCF runtime; second, you need a managed .NET application in which you can host ServiceHost. It is your own responsibility to write the code that starts and stops the host. Please read the following link for your reference:
http://msdn.microsoft.com/en-us/library/bb332338.aspx
Best regards,
Riquel
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