Phone app comes up when the phone is unlocked by swiping I have a Motorola Moto G and have just upgraded to Lollipop.
Every time I wake the phone up by swiping/logging in, the phone app comes up as if I want to make a call.

Is there any way to stop this happening? I'd prefer just to see my home screen.
If you just upgraded to Lollipop, my guess is you're swiping from the left side to the right side, the way you did pre-Lollipop. That doesn't work on Lollipop. Lollipop is unlocked by swiping from the bottom to the top. Swiping from the left to the right unlocks you directly into the phone app (which is why its icon is in the bottom left of the lock screen), and swiping from the right to the left unlocks you directly into the camera (which is why there's a camera icon on the right).

Takes a few days to get used to swiping up instead, but once you do, you're golden.