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@Sam_Doman
You'd be able to fill that with tig weld (braze won't work, Brucy), grind, polish and re-drill it, but it is likely to crack again unless it's heat treated, because the temperature of welding it will make the crystals much bigger.
Your best bet is taking it to a local engineers and asking them to do it for you. They probably wont charge more than £15ish for a job like that (minus the heat treating) it wouldnt take long to do and will make the hub useable again.
It looks like that spoke was taking more strain than the rest for the hub to crack like that, this is due to uneven spoke tension. You all probably know how important even spoke tension is, and this really demonstrates it. When a whole section of flange cracks off, it's normally due to spoke tension being too tight all round. Make sure your wheels are built and trued by someone who knows what theyre doing.
Sorry if I'm being really patronising, I'm new on here. I'll shut up if you all want me to!