Yes, ATC Lasham do overhaul aircraft whose stay is measured in days but the vast majority of the aircraft at Lasham (especially those outside) are there for storage purposes.

See the pictures in this link…

http://www.dailymail.co.uk/news/article-1083888/Pictured-The-graveyard-credit-crunched-budget-airlines-send-unwanted-passenger-jets.html