Leaky oil seal

Fitted some new plugs yesterday and noticed I have a slight oil leak around plug 1, it's coming from the sensor that's held in place by the coil bolt, does anyone know what the sensor is so I can order a new seal ?
 
that's the vvt solenoid...


it wont be that - its the small rocker cover bolt that leaks at the side of it - common fault - remove/clean/dab of silicone and refit it
 
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