Thank you Peter that is just what I was looking for. This will enable me to
keep the changed values of each of my particles between frames but I still
have a little problem. I have a #while loop at the start to set all of my
initial values and I only want to execute this once. If I have got my head
around this correctly would I just have a seperate script to write the
initial values and then run my main script reading these values in and
updating as I go.

Thanks again

Dave (particle system noobie)

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