It's quite a common request we get and it's a feature that those
companies that have exclusively UK call centres commonly advertise.
A couple of providers with only UK call centres are:
Plusnet
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Full details:
http://www.broadband.co.uk/provider.jsp?i=59
Brief: Universally available supplier, call centre based in Sheffield,
they have just increased their download allowances at no exta cost.
O2
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Full details:
http://www.broadband.co.uk/provider.jsp?i=63
Brief: Free UK based customer phone service. Unlimited downloads, offer
faster than average speeds, but not universally available.