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Mazie, You were so right about how cold it can get!
Even though I'd taken heed of your advice and used extra bedding, it still got pretty cold in the wee small hours!
The mozzies I'd seen earlier after I put the tent up, seemed to have gone and neither me or the dog got bit once.
I remembered something about elder leaves as an insect repellent, so I cut a few sprig's, scrunched them up then strew them around on the ground sheet.
If that worked or I just lucky, I don't know but it cost nothing, so i guess its worth remembering.
Thank you all for your replies and experiences.