[colincurry]

Thanks again Andrew.

In the end, I contacted Panasonic (really the sensible thing to do when you think about it). I ended up with their S4 card which has a top speed of 20MB/s. I think that their S2 would have done (similar specs to the Sandisk one you are using).

Having had problems, I thought it safest to go with the proprietary brand and make sure. When someone gifts me a Canon 7D, this will all be academic!

You said that you got 22 minutes of recording. Was that the total time before the card was filled, or just when you got fed up, please?

Colin