A nice selection there Kath, and yes, wrens are often very shy.
If you are keen to get a wren, or other species a trailcam may help. Being unmanned the birds and other visitors will not feel threatened, plus, you'll see waht visits while you're out, or in bad at night...
Kath10 said:Aww great idea Mike, I would definitely love that...
It will very likely astound you.
I've quite a few trailcam vids, daytime and nighttime, on my Flickr pages if you want to have a nosey.
https://www.flickr.com/photos/peak-rambler/albums