Thanks to you both for the info about this.
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Now I've registered for online access to account details, and I'm just browsing around, and ...
I was about to apply for ReiseVerspechen (Passport), but ...
Have Vodafone altered international or roaming tariffs? I found this -
http://www.vodafone.de/privat/mobil_...and/60214.html
- and from the pop-up box on there it seems that there are different tariffs listed for local landline, local mobiles, calls to Germany, from each of over 100 networks. I'd be quite tempted to believe that these were all out of date, but the exchange rate for British Pounds says as at 4.12.2006, and there are quoted rates for videotelephone (which didn't exist a while back)
Strangely, if correct, it appears that some roaming in UK is cheaper on other networks than on Vodafone UK, and maybe cheaper than the rates on Passport with Vodafone Germany