Excellent Thanks again Rick. I did get an error stating "For each may
only iterate over a collection object or an array", but removing
the .address from the end sorted that.

I do now have to loop through the same data to find the end time. I
thought I could work this out for myself, by using the same code but
working backwards through the offset range, but, i'm stuck - how do I
work through a range in reverse?

Regards,
Matt