Spooky. Just found that but thanks for the link. I'll see how I go with whatever Sky send me but I've been happy with the DGN3500 and I've a feeling wireless range could be an issue with the Sky router. Gigabit LAN speeds are also a bonus.
Speaking of which, my Cat5e has been playing up. Maybe the Sky engineer will help me replace it for a cup of tea and the correct financial renumeration 
It will not be a SKY engineer, it would be a Openreach engineer.
Also are you sure that you have an engineer install, unusual this day and age for adsl.
And as i have already said ,there will be no problem using your own router. The problem comes in finding out your username/password that is embedded in the SKY supplied router.
Also using your own router on SKY woulod be breaking their T&C,but as you will also read on the forums, I like many others had or are using their own routers fore years and nobody has been cut off.
Obviousley, if you have a support request. mentioning that you were using a NON sky router would end the support call pronto.
Why is it tea and bickies nearly always work
tonym