Hi Michael, I'm Alan, welcome to the forum.
To hear both sides of a radio conversation you need to be within range of both transmitters.
VHF is called a to the horizon band. So the further you are from a transmitter the less likely you are to hear it. Thinks like hills, which Derbyshire has a few of block signals as do houses, trees & most other obstructions.
So the aircraft has little but fresh air between it & you & the ground station has all sorts of things between it & you. Thus the aircraft's signal travels further.
If you look at the image below you will see that the hill stops one aircraft at 6000 feet being seen, but the Helicopter at 2500 can be seen.
The same would apply to what you hear.
From the top of the hill you will hear everything. But if you live the wrong side of that hill you will just hear the aircraft & not the ground transmitter.