Cane creek Ergo grip. http://www.sjscycles.co.uk/product-Cane-Creek-Cane-Creek-Ergo-Control-Bar-End-Grip-II--Black-11062.htm
Cheap alternative http://www.sjscycles.co.uk/product-SJSC-SJSC-Ergo-Control-Bar-End-Grip--Black-13134.htm Also nice. Serfas Stabilizer II
I've just ordered these, which look a bit poo, but should be comfy.
@Smallfurry started
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Cane creek Ergo grip.
http://www.sjscycles.co.uk/product-Cane-Creek-Cane-Creek-Ergo-Control-Bar-End-Grip-II--Black-11062.htm
Cheap alternative
http://www.sjscycles.co.uk/product-SJSC-SJSC-Ergo-Control-Bar-End-Grip--Black-13134.htm
Also nice.
Serfas Stabilizer II
I've just ordered these, which look a bit poo, but should be comfy.