Hi, I have had the above for a few years now.
Except for a few minor electrical gremlins (if you call the radio not working minor) I have had the flat or not enough power battery problem a year or so ago. Put new bigger battery in no further problems until recently.
Its not used that much so I have a solar panel to keep the battery charged up (sunlight permitting).
It gave one warning sign when it was harder to start than usual ,then it was driven a few klms and restarted fine.
The next day there was no sign of the starter at all.
Thinking it was maybe a flat battery put it on the CTek and also tried my 'Jumper Battery' no go.
I have checked the Battery leads , and retightened them. Sprayed WD40 on all parts that may have got some condensation on them.
Lastly, checked other posts on the forum to see what it might be -most not applicable but tried a few things -still no go
There is a slight clicking noise which seems to be coming from the interior fuse box area. It doesn't sound loud enough to be the solenoid on the starter motor.
Unfortunately, I am some distance from a RR mechanic and it would need to be towed if I can't get it to fire up.
Any help or ideas appreciated.
 2006 4.2 S/C with Tow Pack, Side Steps, DRL's, 19" & 20" wheels, additional 110 ltr Fuel Tank Roof Rack and performance mods.

1952 Rover 75 (Cyclops) First Car !!! Fond memories -was restored-good for 93mph.

If your CTEK says the battery is good, and you have power in the cabin, I’d look at the starter circuit to start with, things like the relay, the clicking you hear could be the relay not working correctly. You could also try jump leads on the solenoid and motor to check they work. 2019 5.0 SC SVA (Current)
2012 5.0 SC AB. Sadly written off by a campervan
23 plate Focus ST (Current)
1942 VEP Ford GPW Jeep (Willys) (Current)
1943 Whites M16 Halftrack (Current)
16 plate Eurofighter Typhoon, 2 x Eurojet engines with 20,000lbs thrust each. 1380mph

Try another relay under the bonnet.

Marked SM

Thanks for the tips -its night time here in the middle of our Winter - so I will give them a try tomorrow and let you know. 2006 4.2 S/C with Tow Pack, Side Steps, DRL's, 19" & 20" wheels, additional 110 ltr Fuel Tank Roof Rack and performance mods.

1952 Rover 75 (Cyclops) First Car !!! Fond memories -was restored-good for 93mph.

Hi,
Just an update. Couldn't do much as RRS was stuck outside . Recharged battery, changed relays around ,checked fuses and tried a Jump Start from another SUV.
Finally the weather was kind to us on Sunday and I was able to jack it up and get to the leads to the solenoid and starter motor.
Wiggled them around and it came to life. So it appears that its just a loose connection. Have to get it up on a hoist to fix it, but at least I can drive it to one now!!! 2006 4.2 S/C with Tow Pack, Side Steps, DRL's, 19" & 20" wheels, additional 110 ltr Fuel Tank Roof Rack and performance mods.

1952 Rover 75 (Cyclops) First Car !!! Fond memories -was restored-good for 93mph.

Final update.
Well it did start and go but kept playing up a bit at times. I had it already booked to go to an 'Indy' (Rova Range) as you call them back in the old Dart.
I thought it was just going to be a loose connection - it was inside the starter motor - so many $$$$ later we have a new starter. He also found where I had a small water leak coming from. It was the radiator . So more $$$$
But its been serviced /fixed/retuned and with the modifications to the exhaust goes well and sounds like a real V8.  2006 4.2 S/C with Tow Pack, Side Steps, DRL's, 19" & 20" wheels, additional 110 ltr Fuel Tank Roof Rack and performance mods.

1952 Rover 75 (Cyclops) First Car !!! Fond memories -was restored-good for 93mph.

Good job! That will keep her going for plenty more years yet! 2019 5.0 SC SVA (Current)
2012 5.0 SC AB. Sadly written off by a campervan
23 plate Focus ST (Current)
1942 VEP Ford GPW Jeep (Willys) (Current)
1943 Whites M16 Halftrack (Current)
16 plate Eurofighter Typhoon, 2 x Eurojet engines with 20,000lbs thrust each. 1380mph