noise or clicking

Good evening all. I have a 16 plate Leon FR184 Diesel hatchback and am enjoying every second of owning it. However lately I have noticed this odd noise when the engine is started (cold engine only) and then when car gets to its normal temperature no noise is present. I am struggling to find...

Drove the car about 1 or 2 miles this morning then a rapid clicking noise started. Turned off the music, opened and closed vents, checked for loose parts then turned the fan down... sound slows down... turned the fan off and the noise stops. Was fine before, could the fan be catching on...