Solitary Bees and Bumblebees

There have been lots of unexpected consequences of getting involved in Farmer's Markets, one of which is that I now find myself on the Women's Institute of approved speakers.
Trying to sort out what to say I sort of stumbled upon solitary bees.Although no expert on them I have tried to build up some knowledge and a consequence of this is that Disappointing Opinion3 - 'I've read bees are dying' has formed.

There are lots of Bee Houses in Garden centres which are just a collection of different diameter tubes but I came across this:-

It is a very professional piece of kit and the manufacturers have the following video about their hive.

The field behind my garden is planted with wild flower seed which would make a great place for the hive. The farmer allows me to keep some of my bees in a copse behind the field so I expect he won't have a problem with it.
The man who produces it uses it as an educational tool and if things go OK I might be able to bring it to the Forest Centre with my honey bee hive.

Its on order.

I was in the garden this afternoon when I heard the buzz of a bumblebee going over head. I belong to the Bumblebee Conservation Trust and had just got an email from them saying March is the time queens start looking for a nest.

The people who provide the solitary bee nest also do a bumblebee nest.

Its on order.