I don't think it's a case of it needs to be in volumes, rather than they're taking a lot of time scanning and remastering these from film, so rather than make us wait longer just put it out as it comes. Realistically there is only going to be a volume 2 as they did half of them on the last set. The Gatiss ones might come, but they just released them on DVD recently and there is no reason they were not HD ready already.
There might be a complete volumes set later but it doesn't make much difference between 2x £20 to buy the separate ones or £40 for a set containing both.
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