Slate roof issue.

[Honest Englishman]

I unfortunately had a dodgy roofer working on my slate roof. The work he did was appalling cracking slates etc. I don't think that he supported his weight while working. Anyway my biggest fear is that he may have deliberately damaged my roof. Someone said that he could have removed the nails holding the slates in so that the roof slates start to fall off. Is it possible he could have done this?
How can I check that he hasn't done this? Any thought much appreciated.

 

[datarebal]

Sounds extreme why would he feel the need?.. but I guess he could cut the fixings with a ripper and leave the slate in situ.
Checking , there is no easy way other than seeing if the slates slide out by applying slight downward force.

Any pictures?

 

[Honest Englishman]

Well it may have been revenge. The issue occurred because I complained to my insurance company that my roof had been damaged when my neighbours rental house was re roofed. It was the same roofer and I could tell there was bad feeling.