Temperature gauge sitting at 3/4 in 2005 Almera DCI SCE

Since I've bought the car the temperature gauge gets to 3/4 and stays there fairly quickly.

I worried about the cylinder head gasket but there is no gunk in the oil filler cap, coolant reservoir or radiator.

I also marked the coolant reservoir with a pen to see if the coolant was dropping but it isn't. It may be going down slowly but not dramatically.

What could the cause of this be? A mechanic questioned if it could be the thermostat or the fan itself. The thermostat doesn't look easy access so I may need to get a mechanic to change that.
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