Leave my car at airport 2 weeks later starts first time gets in this morning left over night completely flat what could have drained it over night ??

Completely flat as in doors would not open, steering lock not releasing, no lights on dashboard... Or flat as in engine not turning over? Could it have been just enough power at airport to start and not too far to drive home so it never charged? Previously..
Vogue SE TD6
Defender 90 2.4
Defender 110 TD5
Vogue 3.5 EFI

Lights on dash and ignition clicking had problem a while back while removing Chavy aftermarket window tint on front windows but it started again a few hours later

Batteries do have a tendency to just die sometimes, even new ones. Other option is current leak somewhere and last is alternator gone (causing a current leak or not charging although for that you should get a warning light).

Mine will sit for 4 weeks and start first touch of the key. MY 2010 5.0 SC Galway green and sand interior!!
Have the Faultmate MSV2 Extreme to be tinkering with the settings etc. !!

Sorry been back a week from my hols

It's my main drive at the moment so not in work today still looking for a little work hac

How old is the battery? It is starting to sound duff.. Previously..
Vogue SE TD6
Defender 90 2.4
Defender 110 TD5
Vogue 3.5 EFI

Update car starts radio not working now so will pull fuse 49 another problem is indicators working but no green arrows on dashboard ?? To be honest not sure how old battery is bought car in march never been a problem but its looking like a new one

And the chavey window tint had what part to play in all of this?

Windows up and down and such

OK...

Check for damp/water in the near side rear compartment where the sat nav and radio units are.

Stewart.

How old is battery?

In my experience if it is 5 years ish - then cut your losses and get a new one.......

Been there done that......