Changing cam position sensor

Hi,

Cam position sensor has been showing a fail code for a few years. Doesn't affect cold starting but hot starting takes a few rotations before engine fires.

I believe the sensor is hidden behind the timing belt, can be got at but difficult. Is it an easy job to replace when having timing belt (and water pump) replaced ?

I replaced a crank position sensor on my daughters car last year (1.4 Kia Rio) and I assume the cam sensor works in the same way, magnetic reluctance producing a series of pulses ?

The crank sensor was only £23, wonder if the cam sensor is available as an aftermarket part ? Won't be doing job myself, replace sensor no problem - timing belt & water-pump NO WAY !

Cheers, Lloyd