Norie,
Thank you SO much for your time. Basically, the issue was that the range I was working with was a range of cells that contained results of a calculation. When the calculation updated it went from current figure to #VALUE! to new figure.
The worksheet_change saw the change from current figure to #VALUE! so the command then started to work but with no figures to work with.
I have got round this by starting to commands during a save procedure instead (which actually turns out to be better than what I was trying in the first place).
Unfortunatley, I am unable to attach the spreadsheet into the forum to show (work related and I'm not allowed - sorry).
Thanks again though for all your help, I have certainly learnt a couple of things
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