Hooray - It's been fixed.
For those interested, here's the working tracert ->
C:\Users\Alan>tracert geocaching.com
Tracing route to geocaching.com [66.150.167.189]
over a maximum of 30 hops:
1 1 ms 1 ms <1 ms api.home [192.168.1.254]
2 6 ms 6 ms 5 ms 217.32.144.160
3 7 ms 11 ms 7 ms 217.32.144.190
4 8 ms 8 ms 8 ms 213.120.181.50
5 9 ms 8 ms 8 ms 217.32.25.46
6 8 ms 8 ms 7 ms 217.32.25.182
7 8 ms 22 ms 13 ms acc2-10GigE-9-3-0.sf.21cn-ipp.bt.net [109.159.25
1.223]
8 24 ms 35 ms 24 ms core2-te0-0-0-6.ealing.ukcore.bt.net [109.159.25
1.159]
9 112 ms 98 ms 23 ms core2-pos1-0-0.telehouse.ukcore.bt.net [62.6.201
.86]
10 18 ms 24 ms 18 ms t2as2-tge4-3.uk-lon1.eu.bt.net [166.49.214.145]
11 21 ms 20 ms 19 ms t2a1-ge4-0-0.uk-lon1.eu.bt.net [166.49.135.17]
12 105 ms 105 ms 105 ms 195.66.224.130
13 101 ms 98 ms 99 ms vb1042.rar3.nyc-ny.us.xo.net [207.88.13.202]
14 182 ms 197 ms 176 ms te-3-0-0.rar3.washington-dc.us.xo.net [207.88.12
.74]
15 169 ms 170 ms 171 ms vb6.rar3.chicago-il.us.xo.net [207.88.12.33]
16 183 ms 198 ms 184 ms te-4-1-0.rar3.denver-co.us.xo.net [207.88.12.22]
17 170 ms 182 ms 173 ms te-3-0-0.rar3.seattle-wa.us.xo.net [207.88.12.81
]
18 167 ms 168 ms 205 ms ae0d0.cir1.seattle7-wa.us.xo.net [207.88.13.141]
19 166 ms 170 ms 163 ms 216.156.100.54.ptr.us.xo.net [216.156.100.54]
20 164 ms 164 ms 164 ms border8.t7-1-bbnet1.sef.pnap.net [63.251.160.18]
21 * * * Request timed out.
22 164 ms 164 ms 164 ms
www.geocaching.com [66.150.167.189]
Trace complete.
