you get the suppports on some connies too pal and to be honest all ive ever done is jut push it past and if i cant i get my hand in there and pick the bulk of it out, get a set matey theyll pay for themselves on the first job and be twice as quick, only things i struggle with are where the roof tiles have come down and theres not alot of room but your gonna struggle with whatever you have with that issue, most of the time i just push the slate back up and scrape it towards me.
i use the unger trad extension poles with mine and a pound shop bucket hanging off gutter to put all the debris in!