Thanks dj, you've been a great help.
I'm back to square one now with my opening post!
I put the battery on charge again before (for the second time since I've had it) which took an hour or so for the light to change green, then removed it from the charger and checked to see if it was still cycling through the 3 colours/voltages.......and no, back to what it did originally, so back on the charger and straight off....no difference, so back on the charger and straight off again....this time I had the 2 of the colours/voltages.......kept clicking the fire button and then all is well again.
I still haven't heard back off the ebay seller from my original complaint and am wondering whether I just put up with it or push him for a replacement.
Rolling a ciggie was so much easier lol.