My friend told me about this unit and I just had to have one as I'd been looking for something that I could maybe take with me when we eat outdoors of an evening.

I'll be over the moon if it keeps flies away during the day

http://www.amazon.co.uk/Lifesystems-Portable-Mosquito-Killer-Black/dp/B002WN1S68

I got mine from Wiggle slightly cheaper but they aren't in stock anymore.