Free International Shipping for one specific customer?

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I have a wholesale dealer in the UK who I want to provide free shipping for. Currently I have a shipping profile setup that allows the option for free international shipping, however other international customers can see it and often select it. Which forces me to email them and send them an invoice. 

I want to set it up so this one customer can get free international shipping but no other international customer can. A discount code won't work because that dealer already has a discount code they use to get their wholesale price. 

Does anyone have any ideas how I can give one specific customer free international shipping without making the option available to everyone?