Just a quick Bookflash. I am always a bit slow regarding these things but a new translation of the Heike Monogatari has been published in Penguin Hardbacks by Royall Tyler. Its been out since January this year (hence my apologies for the slow flash) but has been garnering some decent reviews. It retails at 30 GBP but can probably be resting in your laps at a much reduced price via Amazon...
I am reading through the Bruce Tsuchida translation published by the Tokyo University Press and using it as a crib with the Iwanami Koten series text. It will be interesting to compare the two since the styles are bound to be quite different the translation I am using currently seems quite loose in some places.
It's one to put on the wish list for sure and for more details you can go here