I took it back to peter stevens.. said, keep the bike for a few days and get it right. I think they did a bit of swapping around etc but as of today they are working very well. I've ridden with them a fair few times now and I think given them plenty of chances to fail.. but they seem to still be going well.
For some reason the very first time I switched them on.. regardless of the setting(even 1 light) they were sooo hot I had to toggle on/off/on/off .. but now they seem to be playing ball - level 1 or 2 seems to do the trick but I am wearing thin gloves and it's not that cold.!
keeping my fingers crossed..