The Lego cash register has been very popular, thanks for your comments. I bet there are lots of things that could be made out of Lego and then disguised to look appropriate for the dollshouse.
I've now finished the final three dolls that I am upcycling. The shops now look fairly well populated although there should perhaps be another staff person. I will keep my eyes open for a decent doll to be a shop assistant. I do have some other dolls in my stash but unlike these dolls it is their heads and limbs that look mutated, not just their hideous clothes, so no good for this project.