I'm obviously in the wrong business
yes you are,apparently that,s the going rate for a 3 bed detached.. Bollocks i,ll just put up with it.or maybe go back to a coal fire we did not have any moss in those day,s,i,m told the sulphur in coal smoke kills the moss.
Good move, having someone in big boots walking all over your roof spraying it with a high pressure jet of water will have 3 results, first you will have a moss free roof, secondly you will now have some broken/cracked concrete roof tiles that you cant spot from the ground and finally the water jet will of penetrated the underfelt in places causing leaks in heavy rain/snow.
Just had a great idea,if i throw bread and other food scraps onto my roof all the Peel shitehawks will fly in and during the ensuing feeding frenzy all the moss will be dislodged and fall to earth,peel will be shite hawk free and i will have a clean roof apart from gull shit which will wash away with the rain,bit like killing two birds with one stone