HAVP and sky on demand proxy servers

[awsandy]

Guys,
Let me start off by telling you my setup.

I have virgin media optical fttp.
wan interface goes to the nte for virgin (optical to ethernet converter)
lan1 supplies staff pc's, security systems etc.
opt1 supplies the wifi ap's and there is some sky plus hd boxes on the same lan.

What i am trying to achieve is the following.

if HAVP is enabled on the opt1 interface the sky boxes cannot download any programmes.
If it is not enabled then the sky boxes are able to freely download from their servers.

Sky have been most unhelpful in telling me the ip ranges and or hostnames for their on demand servers.

Is there a way of setting havp to not scan the traffic that goes to the sky boxes ?

Many Thanks

andy