Stream is for broadband-only customers. If you already have VM-TV, you can have additional boxes but not a stream box.
Disney+ may or may not be coming to 360/V6 (if anyone in VM knows, they'll be under NDA), but any internet-connected TV might have it in the meantime.
I'm still not clear if the "quality" issue reported in this thread is pixellation/picture breakup, or something else. And if it's the problem of the SD channels being upscaled to HD, then the £7/month HD supplement seems to me, the most cost-effective option.
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