Flying Hellsteed miniature from ManticGames.com.
I don't believe a winged hellsteed currently exists at Games Workshop (let me know if I'm wrong !). If you want one you would have to buy some wings from the bitz sections and make your own, or I guess you could buy Morathi and use her Dark Elf Pegasus.So, I was pleased to stumble across a Vampire Lord on a hellsteed on the ManticGames website. I've never seen this company before but it looks like they produce Elf and Undead armies, amongst other things. The site itself is quite tidy looking and the miniatures are pretty decent quality.
Anyway, here's the blood sucking brute. Not bad at all and he should save me quite a bit of conversion time. The model isn't cheap but it's not too expensive either - it's £18 so it's roughly comparably to GW prices. The wingspan is actually a bit wider than it looks from this angle and the sword is pointing forward (as opposed to being broken !)
Their undead models are fairly good, esp the Reapers and Ghouls (which I guess look more like Zombies).
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