I have actually found a blue grip, but at £60 it is pricey so can wait until next month,
Amazon Blue Grip
No idea if it is any good. I have a Lexar silver SD card and a Lexar gold micro SD card so that the speeds match, I'm not sure whether to have the micro Sd card as backup or just dump the JPEG's onto it.
Amazon are 1 stop away now for my screen adapter and M42->FE adapter, will take it out for a spin once it starts to get a bit darker, Im going to use an old 58mm F1.2 to really test the focus assist tools as my failure rate on the Sony was depressingly high at F1.2, so it will be a good first test