Ben has responded to your other post here. Please get back in touch with him and we can look into this for you.
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Welcome to the Community Forum and thanks for your post. It's great to see new faces here. I'm sorry to hear that your V+ HD boxes aren't accessing On Demand.
I have been able to access your account via your Forum details and run testing to both boxes.
I have sent new signals to both boxes, please do a full reboot on both and retry your On Demand services.
Please let me know how you get on with this. If there's still a problem then I can arrange an engineer to check this out for you.