ModelCitizen has pointed out that time-of-day may be significant.  

I know when testing for a BBC RealAudio bug I found that BBC servers
used to drop data on R4 more frequency between 5.pm-7.30pm Mon-Thur,
about 11.00-12.00 Sunday. This is an indication that certain parts of
the network between BBC and my PC were getting congested.

The same sort of issue might be happening with Virgin - for example, at
certain times of the day, some of their network may be getting congested
and the backbone switches start dropping data packets and so are relying
on BBC to resend the dropped data - this could cause a stream to stop. 
There are many other scenarios which are not "bandwidth shaping" but
just traffic management.


-- 
bpa
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