I have a different reliable British car in storage, a Lotus. It is stored for a lot longer than 6 months. It's back in Australia while I am here working in the US. It gets driven when ever I get a chance to go back, which before covid was once a year.
-It is on a battery tender, mainly for insurance reasons so the alarm/immobilizer still works.
-Fresh fluids every year. It runs DOT5 brake fluid so that needs to be changed as it absorbs water and eats rubber.
-It is sitting on really old tyres not to flat spot good ones.
-Desiccant dehumidifier(DampRid) containers on the interior to stop mold/mildew growing in humid summers.
-If possible I have someone check it every few months, start it, pump the brakes, check for leaks.
It's been almost 4 years now and always starts and runs perfectly after sitting for a year.
I also travel a lot for work and my old LR3 and now LR4 use to sit for 4-10 weeks at the time and always been fine. Only once it had a flat battery and just used a battery booster to jump start and it was all good.