Drivers door opened whilst moving !

[WhyTwo]

Thankfully I was only doing about 25. Went over a bump and the drivers door opened. It then did so 6 or 7 times in the mile or so until I could safely pull over. I fiddled with the catch and it seemed ok so I set off after firmly shutting the door and had no further issues despite driving the same road and deliberately seeking out bumps.

Is this something anybody else has had to deal with? With Le Mans less than a week away I don't have time to take in and get it replaced, is it something I could easily replace myself? Or do I just write it off as one of those TVR things?

[popegregory]

I understood they were supposed to lock when moving. One door button that looked like a window button to a friend of mine who got in a quickly proved otherwise.