don't get it til we here what the others say, i have stock of them in my local argos as well, but it had a couple of bad reviews but it comes out at 4 star i am thinking for just spraying on a conny roof it will be good enough, then a bonus if they have a outside tap rinse off with that after scrubbing then finish off with wfp, i have combi ladders which go into step ladders and extend as well to 11 foot i just use these for access for wfp but they convert into step ladders so will use these for conny roofs with spayer cos some coony roofs are rather large.