"Jono" <nothanks@blueyonder.invalid> wrote in message
news:mn.fb737d7388d6820a.48968@blueyonder.invalid. ..
> I will try my German number in a bit, however, even though I have set
> everything up as 004401 or 0044870 (for the UK ones), the number that
> is presented is not in the format 00441, nor +441 but 01. Therefore, I
> suspect that the German one would be correct for dialling a German
> number......

Yes, of course the CLI is presented as 01. This is because your provider in
the UK (e.g. BT) is correcting the 00441 into 01.
If you use a german number for outgong CLI, the number will be presented as
0049xxx except in Germany, where it will be presented as 0xxx