PS If this site believes I am going to start spelling realise with a z, it has another think coming
Quite right too. I recall when working in Leatherhead writing a paper and submitting it to our editor (a Portsmouth supporter, but she was OK). I had written "sulfur" and was admonished for doing so. My defence (not as my spell check would prefer "defense") was that IUPAC (International Union of Pure and Applied Chemistry) now used sulfur was met with - "We are always interested in the opinions of IUPAC but here at LFRA we will use the English - sulphur."