The London -> New York round trip is 65ms or more even from a datacentre either side.
Ping from Telehouse North London to a Level3 router in New York Internet Exchange:
PING 4.78.160.37 (4.78.160.37): 56 data bytes
64 bytes from 4.78.160.37: icmp_seq=0 ttl=251 time=67.377 ms
64 bytes from 4.78.160.37: icmp_seq=1 ttl=251 time=67.493 ms
64 bytes from 4.78.160.37: icmp_seq=2 ttl=251 time=67.471 ms
64 bytes from 4.78.160.37: icmp_seq=3 ttl=251 time=67.586 ms
^C
--- 4.78.160.37 ping statistics ---
4 packets transmitted, 4 packets received, 0% packet loss
round-trip min/avg/max/stddev = 67.377/67.482/67.586/0.074 ms