"I am in Carshalton Surrey, and heard a plane flying overhead that did not sound right. This was shortly before the explosion, which we heard."
I looked it up on a map, and Carshalton Surrey is 30+ miles to the south of where this explosion occurred. So this chick is probably full of it, even if a plane ultimately is found to have been involved. But that won't get in the way of the jumping to conclusions...
Yes, Carshalton is not anywhere near Hemel.
Hertfordshire Police statement says that they do not believe the causes of this incident to be sinister, say Sky News.
Oh I know...I wasn't saying it happened, just showing the person who asked the "plane" comments that had been made...but I'm not sure all were made from the same witness?....In any case, I'm not trying to develop any myths, just was trying to answer a poster...and those were just some of the reports.
I'm sure it'll be quite awhile longer, with a lot of theories, rumors, etc. before we even get a fraction of what's going (or went) on! :-S
You can find the location here:
http://maps.google.com/
Just enter "Hemel Hempstead, England" and then look for the north/south blue line labeled "M1" where the east-west orange road A414 ends at it, east of the town. The aerial photos are crappy, but it appears to be in the "Hemel Hempstead Industrial Estate" northwest of that intersection.