Looks like a routing issue.
[me@linuxbox ~]$ traceroute gridwatch.templar.co.uk traceroute to gridwatch.templar.co.uk (185.113.128.151), 30 hops max, 40 byte packets 1 router.jasper.org.uk (192.168.1.1) 0.924 ms 1.322 ms 1.824 ms 2 206.core.plus.net (195.166.130.206) 26.222 ms 26.643 ms 28.063 ms 3 irb.13.ptw-cr01.plus.net (84.93.249.49) 28.619 ms 29.782 ms
30.995 ms 4 195.99.126.138 (195.99.126.138) 31.956 ms 195.99.126.182 (195.99.126.182) 33.723 ms 195.99.126.138 (195.99.126.138) 34.137 ms 5 * 109.159.254.139 (109.159.254.139) 37.602 ms * 6 peer1-xe2-1-0.telehouse.ukcore.bt.net (109.159.254.136) 38.870 ms *
109.159.255.109 (109.159.255.109) 39.753 ms 7 * * * 8 * * * 9 * * *
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[me@linuxbox ~]$ telnet gridwatch.templar.co.uk 80 Trying 185.113.128.151... telnet: connect to address 185.113.128.151: Connection timed out telnet: Unable to connect to remote host: Connection timed out