During the autumn/winter months my spare alloy wheel is always saturated in condensation the boot its self & inside the car is 100% bone dry why ? & how do I cure the problem ?

One trick is the old tipper drivers trick of keeping cab floor dry.
Cover your spare with a complete newspaper. This will absorb the condensation. Just remember to change every so often.
On my old Disco 1 i had to completely remove the carpet and the foam underlay as it was soaking.
My reckoning that the dampness came from condensation on the hatch to top of fuel tank. After i dried out the carpet(3 days) i covered the hatch with a newspaper, which i checked and changed,. Five years later when i sold the Disco 1 the carpet was still bone dry.
Just my observations.
Merry Christmas Jim A
Fl2 HSE 2010 auto
Disco 2Td5 auto 2002 gone
Disci 1 300Tdi auto 1996 gone

Sit it on & wrap in bubble wrap. Two layers if necessary.

We used to get condensation on the trim panel of the tailgate from sleeping in the car, a lot of condensation. Since putting in acoustic insulation foam the condensation stopped.

The tyre needs a bit of insulation so its cold thermal mass has a barrier between warmer humid air. Procrastination, mankind's greatest labour saving device!

Acoustic insulation ARB TPMS 3xARB air compressors After cooler Air tank On-board OCD pressure air/water cleaning Additional 50L fuel Carpet in doors ABE 2x1kg Waeco 28L modified fridge Battery 4x26ah Solar 120w Victron MPPT 100/20 DC-DC 18amps 175amp jumper plug Awning 6x255/60R18