lead valley being replaced with code 5 lead ,old valleys been stripped out denailed any nail heads sticking up have been hit down,brushed down, there should have been a breathable felt membrane used to go on top of the old sarking to let the lead expand over the sarking freely customer didnt want the extra cost (the custromer is a plumber to trade)15/19mm tilting fillet used for upstand for lead , lead cut to size,and dressed in the best that this mainly plasterer can do