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I must admit I have been wildly inconsistent here - but I'm not alone.
Wikipedia has a pile of information here - as they say:
The -ize spelling is often incorrectly seen as an Americanism in Britain. It has been in use since the 15th century, predating -ise by over a century.
However - language is defined by culture, usage, and readers, not by history. I was brought up Australian, and am now living in the UK and on the path to dual citizenship - so I want to use British english, not due to anti-American sentiment, just because I like to use the language of the place where I live.
The Wikipedia article indicates "The ratio between -ise and -ize stood at 3:2 in the British National Corpus up to 2002" - and while the OUP and Oxford style guides suggest 'ize', they are outnumbered by other organisations.
Most importantly, I'm a huge fan of the UK Government Digital Services, and their style guide is good enough for me:
... use ‘organise’ not ‘organize’, ‘modelling’ not ‘modeling’, and ‘fill in a form’, not ‘fill out a form’.
TL;DR: I'm using 'visualise' and 'visualisation'Edit this page on GitHub