Apple and Samsung dominate the market by a considerable margin, so any other brand is having to compete on a much smaller share and, unless they're prepared to give the networks a very good deal, will probably be frozen out by the costs of running another purchase account and dealing with stock control. Vodafone stocked HTCs up to the M9, but then dropped the brand. I think it's unlikely they'll be adding them back in the near future.
The alternative is to go to Carphone Warehouse, although their tarriff deals sometimes aren't as good. The bonus, though, is that the devices they sell aren't network-branded, so you get OS updates quicker. (On less popular brands, networks often don't provide them at all).
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