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Thank you Kovid,
Sorry I meant to reply sooner - I have spent a few evenings trying to work out what I'm doing based on your pointers. I'm getting somewhere (though in the end its not actually that many lines I've written - just trying to understand which functions I thought I needed) but I've more to go.
Whether I get somewhere or get stuck, I'll post what I've got later so others can see and help (potential help to them).
Thanks,
Tim
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