> Try 'ping -i 60 www.google.com >> pingfile.txt'

In the end I set up a small script to output the date/time and then the 
result of 5 pings, this then gets run every minute by cron. I then wrote 
a small C# program on my windows box to grab the log from the pi and 
process it into CSV format for general graphing and analysis in Excel. 
It's only a few regex's but my Linux knowledge is limited so would have 
spent hours trying to do it on the pi. Also my BT modem handily has a 
USB socket on the back which I can power the pi from, so it's all pretty 
neat.

As you can imagine though there were no errors at all since Friday 
evening when I got it running. 1 ping was not received out of about 15k 
sent, and the response times were all pretty normal. BT did indeed phone 
back when they promised (I even got a text to remind me) but of course 
their comment was that the line is stable. I did persuade them to carry 
on their "test" for another 5 days, I hope it breaks during this time.

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