Included .co.uk?
I actually have my own nameserver 
I used to have 3 hosted on completely different networks, but it worked out cheaper/easier to outsource the redundant servers to a DNS hosting provider.
That said It depends what the domain is pointing at as to if I bother to use Redundant nameservers or point the domain at the same physical box for both primary and secondary DNS.
For my domains that I use email on then it absolutely makes sense to have multiple name servers to avoid losing email if the primary goes down but for some of my others they could fall off the internet for a week or more and it would be no great loss.
Edit:
I was only asking about the domains on the off chance I wanted another .co.uk, I'd normally use someone else to register my domains but I think I get 2 included with the broadband.
I used to have 3 hosted on completely different networks, but it worked out cheaper/easier to outsource the redundant servers to a DNS hosting provider.
That said It depends what the domain is pointing at as to if I bother to use Redundant nameservers or point the domain at the same physical box for both primary and secondary DNS.
For my domains that I use email on then it absolutely makes sense to have multiple name servers to avoid losing email if the primary goes down but for some of my others they could fall off the internet for a week or more and it would be no great loss.
Edit:
I was only asking about the domains on the off chance I wanted another .co.uk, I'd normally use someone else to register my domains but I think I get 2 included with the broadband.
I use a mix of hexonet (because they're the only .co.uk registrar I've found that will let me set IPv6 glue) and Fasthosts (can't remember why, but I fell out with 123-reg for some reason, possibly because they didn't let me assign more than 2 DNS servers per domain).
