Need to give the internal handle on the drivers door a pull to get central locking to unlock the door - can I fix this?

Hi, would be really grateful for some advice.....the drivers door on my 03 Fabia has developed an annoying problem.  When press the key fob, the central locking opens all doors except the drivers one. I have to open the passenger door, lean across and pull the inside handle just once and then press the key fob again. The door only unlocks if the internal handle is pulled first. 

I just wondered if this sounds like something I could look at, maybe something misaligned that I could find if i removed the door handle maybe? Or maybe this is more involved and needs trip to garage.

thanks