your latency of 196 ms from singapore to london should be acceptable.
i assume your running VPN for both ends. i would suggest performing ping/traceroute using public IPs to get your latency figures.
to do benchmark, you can use a public traceroute or better if you can find a public router (looking glass) in singapore. see useful URL and sample traceroute captured from STIX to a public DNS server in UK:
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