Its a bit of pain to replace the router.
Ive done it, replaced with a Draytek. The router needs too be able to authenticate using MER (Mac encapsulated routing), of which the majority of routers don't do. It uses
Draytek do this, there is an Asus that does it to, and i think that hacked firmware you can run on link sys routers can also do it.
You will need to use an app called 'Wireshark' to connect to your Sky router to get the user name and password out of it, which will be output when you boot the router. There are some instructions on the net about this. I did read there was a website you could put the mac address of your router in, and it would give you the password, but i never tried this.
In summary, need to be careful which model of router you replace it with, and most won't work.