Great ladder Steve, but as above we use ladders very rarely we have a telescopic 3mtr which does reach flat roofs, and is ce marked cost £65 off flea bay. It's ONLY used for access, it's not for working off, other than a squirt of lubricant in the winter months it's worked great.
I did have one before that got abused ie.. People using it on rough uneven ground using while cleaning cony roofs and general misuse and broke after a year, but it did get a hell of a bashing with an 19 stone man on it
Darran