I have a vague memory of possibly this.
one which I had to adjust some settings as the routr had the wrong software fo the site it was being fitted to (I remember this as I had to repeatedly have to tell the first level help desk I'm in Norwich not Chester, due to the references on the router that arrived on site..... well whenever I hear "Computer say's No"
The other occasion was due to the fact the router insisted on using dsl for up or downstream (can't remember which so long ago) and one of the ISDN lines for the other.
On both occasions a tech desk e-mailed some software to me so I could load it on the router but making a few modifications first.
Sorry I can't be any ore specific as I didn't have a clue what i was doing, just following instructions over the phone, but the problem you mention rings distant bells.
Incidentally, yours hasn't anything to do with the NHS N3 project ?