Thanks for all the replies. I have to say the only reason I tend to use BNN is to make sure I don't fly into Luton's airspace i.e keeping to one side of a specific radial and I use it as an entry point to Denhams circuit whe they're nusing runway 24. I know the Westcott NDB area is a minefield, despite the fact that it is an NDB station it is a great VRP but I try not to fly over it. When the event in question happened I was flying a considerable distance from the WCO NDB and still north of Halton.