Thanks for the replies
It looked quite promising yesterday - as I was on planting in the garden, I noticed a small solitary bee on one of the apple trees. So there must be some Osmia rufa out there somewhere.
Sorry about the quality, I took the pictures on my 1.3 Megapixel mobile phone hehe.
This is my setup. As you can see, I have 2 nests which are all free. My camera is facing north so therefore the nesters are facing south (Theres just no sun today!!).
Is there any chance of seeing other peoples setups and where they're placed in the garden? Also when is the latest in a season that an Osmia rufa has found the nesters?