[Mirrors] New UK mirror

[David Boswell]

> Also on http://mirrors.mozdev.org/
> there seems to be a number of dead or incorrect urls.

Thanks for pointing that out.  That page is out of date and we are
working to put together an updated mirrors system that will automate
things and will keep mirror information current.  For anyone who is
interested, the open bugs related to our mirrors setup can be found at

https://www.mozdev.org/bugs/buglist.cgi?query_format=advanced&short_desc_type=allwordssubstr&short_desc=&product=mozdev&component=mirrors&long_desc_type=allwordssubstr&long_desc=&bug_file_loc_type=allwordssubstr&bug_file_loc=&keywords_type=allwords&keywords=&bug_status=NEW&bug_status=ASSIGNED&bug_status=REOPENED&emailassigned_to1=1&emailtype1=substring&email1=&emailassigned_to2=1&emailreporter2=1&emailcc2=1&emailtype2=substring&email2=&bugidtype=include&bug_id=&votes=&chfieldfrom=&chfieldto=Now&chfieldvalue=&cmdtype=doit&order=Reuse+same+sort+as+last+time&field0-0-0=noop&type0-0-0=noop&value0-0-0=

David