[Imp]

Thats probably because the home Guard was not formed then, try later possibly mid 41 without looking. They are probably under the misc tab also as not regular units.
On the map game selects location based on what happened hence N.Africa. If you want Britain (no idea if included) or another location do the following.
On battle screen select view map
Select map generator (by save button)
Select help
Choose editor help
About 3rd page lists all Bat Locs
Choose one or more & exit back to the map.
Press ( , ) or think top button & enter the 3 numbers.
( = ) will regenarate using same location