OldMohawk has previously quoted the site below for an intersting account of the shelters...
https://mashable.com/2015/07/24/wwii-backyard-bunkers/#39JMvrYzPkqc
The picture of the two ladies and a child erecting the shelter is in fact associated with an article.
Under the picture there is an article concerning the first deliveries of shelters to Birmingham, which were to Selly Oak and Selly Park....
...astonished womenfolk offered access to their gardens, and heavy parts were carried up by railwaymen and dumped in the small areas at the back of the houses. "We had no idea they were coming" a lady told the mail reporter... "We don't know how to put them up. No instructions are being given"....
"What ever shall I do with all this," one woman asked, "I am on my own, except for a lodger. My two boys are in the Navy and I can't possibly put these up."....
At another house it was stated that the first difficulty would be digging the hole, "the ground requires a pick," it was stated, "and across these gardens three sets of pipes are laid, land drains I think."....The General impression received was that the shelters, for the moment, present a tremendous problem, and few could say decisively whether they are to be put up at all.
Some of the problems raised have been covered by an official explanation of the procedure to be adopted. Each household to which a shelter has been given will receive a booklet of instructions showing how to put the various parts together. Householders may then erect their shelters or they may get in touch with the Corporation, who will, on their behalf, have the parts erected on the best site. Those who wish to use their own labour can have the best site marked out for them by the surveyor, although may choose their own site. Should anyone wish to go ahead, the shelters erected in the parks today will show how best to set about the task.