Hi Mark.
Wouldn't a local server be more optimal?
IE:
server 0.nl.pool.ntp.org server 1.nl.pool.ntp.org server 2.nl.pool.ntp.org server 3.nl.pool.ntp.org
Or for Africa server 0.za.pool.ntp.org server 1.za.pool.ntp.org server 2.za.pool.ntp.org server 3.za.pool.ntp.org