Images shown below are screen shots from the GPS which records track. FLap 40 your plotting is pretty accurate and would agree with the GPS trace other than the fact that we were the west side of your blue line and yes at that point we were already at 1500ft ready to go into the Denham ATZ.
If we had gone steaming through the Luton Zone it would be understandable but the trace shows we were clear, the VOR tradck took us clear and looking out the windows and identifying the town below us took is clear.
Also as pointed out there has been a positive response from Luton on the flyer forum and I am happy to discuss this to educate all.
http://www.tdisdi.net/aviation/luton2.bmp
http://www.tdisdi.net/aviation/luton.bmp
