Here are some pings and traceroutes which may help Wolfram or RPi staff diagnose and fix the problem.
It may be helpful if someone outside the British Isles could also post some traceroutes.
From my home IP in Tewkesbury, UK on PlusNet FTTC:
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aoakley@thoth:~$ date
Sun Sep 21 10:28:10 BST 2014
aoakley@thoth:~$ ping -c 5 repository.wolfram.com
PING repository.wolfram.com (140.177.204.60) 56(84) bytes of data.
--- repository.wolfram.com ping statistics ---
5 packets transmitted, 0 received, 100% packet loss, time 3999ms
aoakley@thoth:~$ traceroute repository.wolfram.com
traceroute to repository.wolfram.com (140.177.204.60), 30 hops max, 60 byte packets
1 router (192.168.0.254) 43.907 ms 43.835 ms 43.772 ms
2 lo0-central10.ptw-ag03.plus.net (195.166.128.197) 18.412 ms 18.378 ms 19.958 ms
3 link-b-central10.ptw-gw02.plus.net (212.159.2.154) 28.721 ms 28.682 ms 28.718 ms
4 xe-4-3-0.ptw-cr02.plus.net (212.159.0.246) 28.604 ms 28.608 ms 28.602 ms
5 10gigabitethernet5-1.core1.lon1.he.net (5.57.80.128) 45.377 ms 45.351 ms 45.327 ms
6 10ge5-2.core1.lon2.he.net (72.52.92.222) 28.465 ms 27.342 ms 27.295 ms
7 100ge1-1.core1.nyc4.he.net (72.52.92.166) 104.963 ms 96.123 ms 96.096 ms
8 100ge7-2.core1.chi1.he.net (184.105.80.37) 114.696 ms 114.668 ms 114.643 ms
9 us-signal-company-llc.10gigabitethernet1-2.core1.chi1.he.net (216.66.74.230) 114.565 ms 114.568 ms 108.312 ms
10 te0-2-1-0.agg01.chcgildt.ussignalcom.net (70.34.131.1) 108.282 ms 108.267 ms 111.929 ms
11 host-70-34-134-194.host.ussignalcom.net (70.34.134.194) 111.919 ms 111.865 ms 111.822 ms
12 206-221-158-46.ip.ctc.biz (206.221.158.46) 111.862 ms 115.560 ms 115.452 ms
13 140.177.203.2 (140.177.203.2) 115.449 ms 112.142 ms 111.972 ms
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aoakley@heget:~$ ping -c 5 repository.wolfram.com
PING repository.wolfram.com (140.177.204.60) 56(84) bytes of data.
--- repository.wolfram.com ping statistics ---
5 packets transmitted, 0 received, 100% packet loss, time 4031ms
aoakley@heget:~$ traceroute repository.wolfram.com
traceroute to repository.wolfram.com (140.177.204.60), 30 hops max, 60 byte packets
1 ip-10-42-95-1.eu-west-1.compute.internal (10.42.95.1) 0.933 ms 1.269 ms 1.547 ms
2 100.70.9.11 (100.70.9.11) 0.809 ms 100.70.9.9 (100.70.9.9) 0.774 ms 0.757 ms
3 100.70.9.25 (100.70.9.25) 0.636 ms 100.70.9.46 (100.70.9.46) 0.588 ms 100.70.9.32 (100.70.9.32) 0.681 ms
4 ip-10-176-182-7.eu-west-1.compute.internal (10.176.182.7) 0.662 ms ip-10-176-150-5.eu-west-1.compute.internal (10.176.150.5) 0.633 ms ip-10-176-102-4.eu-west-1.compute.internal (10.176.102.4) 0.608 ms
5 ip-10-176-137-62.eu-west-1.compute.internal (10.176.137.62) 1.200 ms ip-10-176-172-122.eu-west-1.compute.internal (10.176.172.122) 5.764 ms ip-10-176-59-178.eu-west-1.compute.internal (10.176.59.178) 3.052 ms
6 100.64.35.27 (100.64.35.27) 0.964 ms 100.64.35.31 (100.64.35.31) 1.314 ms 100.64.38.215 (100.64.38.215) 1.232 ms
7 100.64.32.200 (100.64.32.200) 2.709 ms 100.64.47.236 (100.64.47.236) 1.445 ms 100.64.47.208 (100.64.47.208) 1.505 ms
8 100.64.20.112 (100.64.20.112) 0.658 ms 100.64.20.2 (100.64.20.2) 0.623 ms 100.64.20.50 (100.64.20.50) 0.881 ms
9 ip-10-1-5-42.eu-west-1.compute.internal (10.1.5.42) 9.125 ms ip-10-1-5-56.eu-west-1.compute.internal (10.1.5.56) 1.586 ms ip-10-1-5-46.eu-west-1.compute.internal (10.1.5.46) 1.147 ms
10 ec2-79-125-0-72.eu-west-1.compute.amazonaws.com (79.125.0.72) 0.628 ms ec2-79-125-0-6.eu-west-1.compute.amazonaws.com (79.125.0.6) 0.878 ms ec2-79-125-0-80.eu-west-1.compute.amazonaws.com (79.125.0.80) 0.862 ms
11 178.236.1.14 (178.236.1.14) 0.833 ms 178.236.0.69 (178.236.0.69) 1.514 ms 178.236.1.14 (178.236.1.14) 0.779 ms
12 178.236.0.230 (178.236.0.230) 1.216 ms 176.32.106.76 (176.32.106.76) 0.684 ms 178.236.0.96 (178.236.0.96) 1.278 ms
13 176.32.106.17 (176.32.106.17) 11.528 ms 54.239.41.103 (54.239.41.103) 11.563 ms 176.32.106.28 (176.32.106.28) 11.336 ms
14 176.32.106.5 (176.32.106.5) 10.834 ms 176.32.106.7 (176.32.106.7) 11.044 ms 178.236.3.52 (178.236.3.52) 10.868 ms
15 10gigabitethernet5-1.core1.lon1.he.net (5.57.80.128) 11.252 ms 11.365 ms 40ge1-3.core1.lon2.he.net (195.66.224.21) 19.349 ms
16 100ge1-1.core1.nyc4.he.net (72.52.92.166) 76.604 ms 10ge5-2.core1.lon2.he.net (72.52.92.222) 11.208 ms 100ge1-1.core1.nyc4.he.net (72.52.92.166) 77.003 ms
17 100ge7-2.core1.chi1.he.net (184.105.80.37) 102.157 ms 94.354 ms 94.328 ms
18 us-signal-company-llc.10gigabitethernet1-2.core1.chi1.he.net (216.66.74.230) 94.609 ms 95.076 ms 100ge7-2.core1.chi1.he.net (184.105.80.37) 94.244 ms
19 te0-2-1-0.agg01.chcgildt.ussignalcom.net (70.34.131.1) 91.987 ms us-signal-company-llc.10gigabitethernet1-2.core1.chi1.he.net (216.66.74.230) 95.004 ms te0-2-1-0.agg01.chcgildt.ussignalcom.net (70.34.131.1) 91.927 ms
20 te0-2-1-0.agg01.chcgildt.ussignalcom.net (70.34.131.1) 92.054 ms 92.099 ms 92.060 ms
21 206-221-158-46.ip.ctc.biz (206.221.158.46) 94.849 ms 94.832 ms 94.648 ms
22 206-221-158-46.ip.ctc.biz (206.221.158.46) 94.864 ms 140.177.203.2 (140.177.203.2) 95.375 ms 95.528 ms
23 * * 14
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aoakley@isis:~$ date
Sun Sep 21 10:34:15 BST 2014
aoakley@isis:~$ ping -c 5 repository.wolfram.com
PING repository.wolfram.com (140.177.204.60) 56(84) bytes of data.
From 213-229-92-171.static.as29550.net (213.229.92.171): icmp_seq=2 Redirect Host(New nexthop: 213-229-92-161.static.as29550.net (213.229.92.161))
--- repository.wolfram.com ping statistics ---
5 packets transmitted, 0 received, 100% packet loss, time 4009ms
aoakley@isis:~$ traceroute repository.wolfram.com
traceroute to repository.wolfram.com (140.177.204.60), 30 hops max, 60 byte packets
1 213-229-92-161.static.as29550.net (213.229.92.161) 19.716 ms 19.769 ms 19.947 ms
2 xe-1-1-1-cr0.rdg.as29950.net (92.48.101.81) 0.494 ms 0.401 ms 0.311 ms
3 ae1-cr0.the.as29550.net (91.186.5.249) 1.511 ms 1.515 ms 1.457 ms
4 10gigabitethernet5-1.core1.lon1.he.net (5.57.80.128) 3.369 ms 3.488 ms 3.427 ms
5 10ge5-2.core1.lon2.he.net (72.52.92.222) 11.771 ms 11.567 ms 11.478 ms
6 100ge1-1.core1.nyc4.he.net (72.52.92.166) 72.555 ms 72.423 ms 72.188 ms
7 100ge7-2.core1.chi1.he.net (184.105.80.37) 83.966 ms 83.726 ms 83.791 ms
8 us-signal-company-llc.10gigabitethernet1-2.core1.chi1.he.net (216.66.74.230) 84.304 ms 84.295 ms 84.380 ms
9 te0-2-1-0.agg01.chcgildt.ussignalcom.net (70.34.131.1) 88.269 ms 88.147 ms 88.035 ms
10 host-70-34-134-194.host.ussignalcom.net (70.34.134.194) 91.181 ms 91.171 ms 91.135 ms
11 206-221-158-46.ip.ctc.biz (206.221.158.46) 91.035 ms 91.174 ms 91.071 ms
12 140.177.203.2 (140.177.203.2) 91.339 ms 91.304 ms 91.212 ms
13 * * *