Thanks both - I really needed some old advert / picture to be absolutely sure. People do not always recollect properly - especially if they need Phillosan!!!1
I'm not certain of the number of letters 'L' there were, but I'm nearly certain it had a 'Y' rather than an 'I' and I'm absolutely certain it opened with 'PH' and not 'F'. In other words, 'Phylosan' or 'Phyllosan'...I suspect the latter.