Re: battery, alternator or hypercondria
Did a quick test when i got home tonight. Headlights on, idle at 750ish rpm, engine has very slight judder, headlights off, tickover gets stronger, smoother, about 800ish rpm (cant say for certain). Lights back on, revs drop, slight judder starts, lights back off, idle smoothens again. Repeat that cycle 5 times.
I am thinking it is the battery as the interior light when the door is open seems to flicker very slightly. maybe the voltage isn't stable under load (yet always starts first time and i have left certain interior lights on overnight before??)
I think i will replace the battery anyway, the warrenty sticker has run out of years so it must be pretty old, and it only had a 2 year warrenty so quality is probably pretty poor anyway.