Emperor Dragonfly?

After taking mum to hospital for her treatment, I spent a couple of hours with a friend and then dropped in at Penny Flash on the way home to see if there were any kingfishers - there weren't and it wasn't very warm either! 
I think that this is an emperor dragonfly, but am happy to be corrected. 

Not sure I like this being at home lark...….

Edit: I now think that this is a migrant hawker rather than a Emperor