you wrote:
how can it be proven that the web-page is hosted in the U.K.
Use an internet provider look-up program such as Sam Spade - available from
http://www.samspade.org
A search using Sam Spade produced the following results:
http://www.dilos.com 212.100.247.147
inetnum: 212.100.247.128 - 212.100.247.191
netname: RSPC-UK-RACKSPACE-INTERNAL
remarks: INFRA-AW
descr: Rackspace Managed Hosting
country: GB
admin-c: IA247-RIPE
tech-c: IA247-RIPE
rev-srv: ns.rackspace.com
status: ASSIGNED PA
mnt-by: RSPC-MNT
source: RIPE # Filtered
Unless you are pretty IT savvy, the above information will probably not mean a lot to you. What it does illustrate though, is that their site is hosted in GB (i.e. Great Britain) and that the company which hosts Dilos's web page would appear to be Rackspace Managed Hosting.
their UK web site address is
http://www.rackspace.co.uk
Their contact address is 8 The Square, Stockley Park, Uxbridge, Middlesex UB11 1BA.
That is far as I can help you on this, I'm afraid.