Bats

Although it wasn't that warm last night I was happy to see some of our local bats out and about. Don't know what type of bats they are but we often get quite a lot hunting over our garden. 
I'd ideally like to find out what they are and see if there is anything we can do to help with boxes etc. 

I'll try and post a video I took last night but might take me a while to sort it out.