Finally got the parts and the time at work to build the drivers.
Calculations did not work out quite right or slight component variations from datasheet mean the calculations figures were wrong.
I was aiming for about 330-350mA but final circuit is more like 240mA. I may change R2 if it's a bit dim when fitted in the light frame. B & G drivers Mosfet does not get to hot without a heatsink but R definatly needs one.