Correct!

In reply to a post by Beetnik:

I've done a factory reset on the router but it still has the same settings as previously. So I still need to change the router settings for wireless. I therefore need to find out how to use telnet?

You should be able to change the router's DNS settings thro' its Web GUI interface. Look for something like
DNS Addresses: Manual/ Auto/ Obtain from ISP on its Set-up page.

and..

IPv4 Address. . . . . . . . . . . : 192.168.1.1(Preferred)

That was my point!

In reply to a post by yarwell:

IPv4 Address. . . . . . . . . . . : 192.168.1.1(Preferred)

That could have been issued by DHCP. It is similar to the IP for the wireless PC.

Or are you inferring that 192.168.1.1 is outside DHCP range?

I believe that the "(Preferred)" indicates the router trying to issue a sticky IP; not a hard-coded IP in the PC. I get it on my Vista PC but not on my XP PC with router DHCP issued IPs.

I've only seen preferred on fixed ip addresses TBH. But I don't do this "IP by MAC" stuff so don't have experience of what that looks like.

192.168.1.1 isn't the greatest choice of fixed IP, if the router is changed it may be on the same address.

No, I don't do "IP by MAC" either. I get the "(Preferred)" on Vista w/out using it.

We'll only know if this IP is fixed for sure by OP looking at his TCP/IP properties on wired PC.

Ah - yes - the DNS servers were set on the laptop. I thought they were on the router. Thought it was a bit odd that Plusnet would use Opendns and Google.

I've changed the settings on the ethernet connection to 'Obtain and IP address automatically' and 'Obtain DNS server address automatically'.

Plusnet have agreed it's a router issue and are dispatching a new one. Hopefully that will sort it.

Post deleted by XRaySpeX

Desktop? I don't think I mentioned a desktop (and I don't have one!)

Sorry, I assumed the Ethernet readings were from a separate wired Desktop.

So what you had before was DNS set on the Ethernet adapter of the laptop and Obtained Auto on the wireless adapter.

Yes -odd wasn't it?