Currently part way through moss removal on my many (too many) concrete tiled roofs, halted for a bit of medical intervention. but hoping to get back up there soonest.... I wonder if moss growth has increased now that acid rain has been reduced perhaps as the result of demolishing all the coal fired power stations...?
K stupidly long working day... been there done that and for years and years, to end up creating all those effing roofs.... Double DUH..!

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SNAP, I don't mind the moss but the lichen is a nightmare to remove. Started last winter but haven't had time nor the motivation to finish the job. A 50° roof pitch doesn't make it easy either 😠
Gordon, I too have some steep roofs, beginning to wish I had made the garage a flat roof instead of tiled. At least my tiles are flat, a mock slate appearance, but they seem to provide ideal conditions for moss to inhabit. I would not fancy removing the amount of moss that is on my roofs from tiles like yours...! A property maintenance chap I know suggested spraying the roof with Deosan Red Lable Hydrochlorite, but just looking at the data sheet scared me off, so back to the scraper and wire brush..