I must say I'm a bit confused. I have been speaking to
all sorts of people and the recommendations vary wildly.

"Ooo - What ever you do don't let anyone pressure
wash the tiles - it will ruin them."

"An Anti Mould Growth sprayed on to the roof will
keep it clear for ten years or more.."

"CopperRidge is the answer... "

"Don't bother - it does more damage removing it than
leaving it alone"

etc...

Not quite sure what to do at the moment.
Something has got to happen because I'm fed up
with the patio being rained on by great lumps of moss...
Most anoying finding a lump of moss in your
plate of salad and barbie... :-)

Roy