Question Author
Thank you all for your responses. Firstly, I realised in hindsight that I should have posted my initial question on the Science section, so in future I will research more carefully and apologies to those of you who felt my question was on the incorrect section.
I live in an area that doesn't have too much light pollution, and not on the Heathrow flightpath. Yes we do have chinooks occasionally at night but they make a heck of a noise and not even a mouse stirred last night. As I said, I watched for a time afterwards and nothing moved in the sky apart from a couple of shooting stars lower in the sky. This was over to the east/south east and below Orions Belt and to Wiltsman no planes were going over and I agree sometimes one cannot hear the planes but you can see the moving flashing lights of planes.
argorstran - there are no overhead power cables and no trees that could cause sparking. This was high up in the sky and if you can work out where Orions Belt was at 0345 this morning in the west country then you can get an idea of the location in the sky.
I also know that when watching satellites they can have the appearance of flashing then not as they spin and catch the light of the sun but as I said nothing moved.
bibblebub - I'll let you know when they do.