Bat s' crazy?

[Cobra]

I was stood outside last night, around midnight, the temperature was around -3.
I watched a "large Bat", unsure of the species, but it was much larger than my normal Pipistrelles,
ducking and diving for food.

I doubt there was much to be had, but I turned the outside lights on for a bit,
in the hope that it might attract any insects that were also stupid enough to be flying.

 

[Jannyfox]

If it's flying in winter it's very hungry. Maybe it didn't manage to take on enough food reserves to see it through. By next month they'll all be getting very hungry and may pop out to feed, but generally only in milder weather. I would advise keeping any outside lights off. Yes they do attract insects and I've seen bats feeding around street lights, but bats will find insects without any help and bright lights can be a deterrent to bats, especially if they're roosting nearby. If your bat is light-averse it may not want to feed near a light and may even try to find a different roost, which isn't a good idea if it's low on energy reserves. Much as anyone would like to help it, it's best to just leave it to its own devices and hope it makes it through.
If you should happen to find it 'grounded' in daylight pop it in a box (use gloves and don't handle it more than you absolutely have to to save it) and contact a local wildlife rescue and someone from your local bat group if you have one.

 

[Cobra]

If it's flying in winter it's very hungry.

Yep I get that, the lights were only on for about 15 mins.
In an effort to help it out.
There were "no shows" in that time, anyway.

I've done quite a bit of wildlife rescue over the years, inc. Bats so no worries on that score