Freelander 2 (LR2) 2010 Landy wont start!

Good morning gentlemen
This morning I wanted to go earlier to work, but looks like Landy hated that!
So, it accepted the key and as usual ''system check in progress'' message appeared and then I pushed the start button. This happened many times before and after few seconds it was responding and starting. Nothing happened this time! all lights were working as usual and no error, just system check in progress message.
I tried again, but again no start! all light were still OK. After couple of times, I tried to check if wipers are working, but the wiper just moved to the middle with low speed and dead! At this point even the key is locked inside the slot and the noise of click click from the relays in the trunk. I opened and checked that: it was 6g9t -14b192 -ca continuously clicking.
At this point, I see weak light of flashers and no respond to anything! Break pedal is frozen and HDC fault message appeared.
Can anyone give some comment?

I imagine you need a new battery, modern ones seem to give up without warning

Sounds like the dreaded FL2 dead battery syndrome.
It's much more common than it should be.

Thanks mates... Which battery do you suggest? Is car part expensive shop? I am new in the UK.

I always use Tayna for batteries. https://www.tayna.co.uk/E44-Varta-Silver-Dynamic-Car-Battery-P7726.html