Help me with my parents roof

[voicey]

My elderly parents had the edges of their roof clad about six months ago. In a storm a couple of pieces came off, one of which is missing. The builder who installed it is ducking responsibility so I will go up there and sort it. However, they are a three hour drive so I'd like to be prepared. Not being a roofer I need a little advice!

This is where the pieces have become detached:



This is what the other side looks like:



This is the piece they have recovered. I think it is the penultimate bit??



This is the marking underneath:



I have two main questions please...

1. Where can I buy a replacement end piece?
2. How are these attached?

Any help or advice gratefully received!

[langtounlad]

https://www.eurocell.co.uk/ridge-and-hip-tiles