GRP dry valley & tiles detail

[SherlockTheFish]

Hi,
I had 2 GRP dry valleys installed (replacing old style ones) and the tiles seem to have some distance from the middle ridge. My roofer claims they don't need to be flush as long as they are past the inner rivet. Neighbour's roofer disagrees. GRP valley specs/ installation guides are not clear. Other than the aesthetic (ok it's nicer when flush), is there any waterproofing or other issue?
Also, there is a hole where the valleys meet at the top. My roofer says it is normal as there is no cement. Is it normal?

 

[datarebal]

It's cr xp don't pay him unless he does it properly. Also the lead saddles are a mess .

 

[DAZB]

I don't tend to come on to discredit anybody's work but this needs it... bad tiling, bad valley, bad leadwork..... just bad workmanship in general, the tiles aren't even straight down the valley edge and apart from a gale blowing into your loft you may even get a curious squirrel or two trying to get in.