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@mashton
When I first setup my PI-Hole I had it as the only DHCP server on the network and also the only DNS server handed out to clients.
The pi it was running in had an intermittent boot up error, which sometimes meant I had to boot it two, three or four times before it came up correctly. After a tripped switch or a power cut I found this most anxiety inducing. It was a single point of failure that would kill all internet access for every device in my house.
So, I have done three things:
Reinstalled the Pi-Hole on a new SD Card. Now it boots reliably. For now.
Got another Pi running dnsmasq as a secondary dhcp server (it and the pi hole serve up different address ranges in my subnet)
Hand out the Pi-Hole as the first DNS server but an internet one (Google or Cloudflare) as a secondary one. (Thinking about it, I haven't actually done this yet - I need to read up about how clients use the DNS servers they get handed, to ensure they use Pi-Hole unless it is non responsive)
Hopefully that gives me much better redundancy.