Would tend to agree with the environment heat, however this specifically seems to be coming from behind the centre column, behind the stereo - now this never was but when I remove the face plate off my stereo its roasting, quite certain its not the stereo but behind that centre column I seem to be letting in much heat the entire centre column (even where your left leg leans on the inside) is quite hot.
I imagine it like there is heat coming in from the engine bay.
Water temp is fine, no warning lights for anything.
OK really stupid question here so preparing to be shot down - I've had the car since Oct last year, not had any services or checks, personally topped up the oil and thats about it. Any obvious spanks to the side of the head here??