RotorCraig's problem
I have had a look into this and it appears that the site will allow you to set the Departure and Arrival aerodromes the same on a Narrow Route Brief. However if you do so it will NOT return any en-route info.
If however you put a second location in, either in the route as RotorCraig did or by specifying different AD's then the en-route info does appear.
An easy way to reproduce this is to set a narrow route EGHN (Sandown) to EGHJ (Bembridge) which is all of 3 miles. You will find you get the en-route. If however you set EGHN to EGHN DCT you get no en-route.
Clearly this has the potential for a serious incident and I have flagged the problem up to Phil Bate at AIS.
Mike