Had exactly the same thing on an MGF which Russell sorted, it just kept locking and unlocking at will, it was dampness in the drivers door lock, sorted with a clean and an good dose of WD40 he worked his magic to get the door open, caught it at the exact moment it locked and unlocked.
well the only thing left is to destroy the lock insed the door so you can adjust the levers
good luck
ADAM_BEFORE YOU WRECK ANYTHING!!,
Take a look at these links.
You can get a set of Jimmy keys or Auto Jigglers, which may help.
Watching the YouTube clips it is actually very worrying how easy it is to get these keys and get in to cars.
However, the clips do not say if the car is deadlocked or just locked on the key.
UK supplier of Auto Jiggler keys
http://www.devonlocks.co.uk/shoppingcart/index.php?main_page=product_info&products_id=42
Youtube links showing them in use.
Good Luck with it
**Bye the way , I have no connection to Devon locks, they were the first UK company in a google search for Auto Jigglers
Gary.
My passenger door lock on my F failed when locked but nothing was happening when unlocking, I had no option but to remove the door card and destroy the lock.
If you are careful you can remove the door card with very minimal damage - the card will split around the mounting screws on the door edge but when refitting, washers around the self tappers will hold it well, similarly with the self tapper thats hidden by the dash with the door locked, the card will pull off, leaving the self tapper in place, just refit with a washer.
A big screw driver or chisel and a hammer will destroy the lock in no time and allow the door to be opened.
Good luck
Nice interior
I would just call the AA