Big thanks to triggernum5 and Evil Ryu, I have now fixed my v1.1 with corrupt eeprom. (flashing red led)
I used eepromagic v0.01, and it restored the eeprom no problems.
I just had to ensure the embedded eeprom on my modchip I was booting off had the same serial number as the serial number eepromagic found on the corrupted eeprom chip. Easily done with xbtool.
Which leads me to ask, eepromagic can obviously see the proper serial number on the eeprom chip, and ignores the serial number embedded on the modchip, can I find the original HDD key using a similar method? I guess not now that I've restored the eeprom, so I have a locked 120Gb segate which might as well be thrown in the bin.
At least I have a working mobo again.
Thanks guys, it's good to be able to register a positive result