Hi,
Yes, being unemployed was another reason to be deported.

I think it is Louvain, north east of Biggar, and it most likely became incorporated into Biggar.
David may have been destined to his sister, but perhaps Overseas Employment Scheme had
other ideas for him.
I looked for the F30A form for James in the hope that "pink card" would be mentioned on
the back of the form, but no luck, for him or Arthur. Either missing or filed under who knows what name. It's not often that I have seen the "pink card" reference.
1920's was the 3rd wave of the Spanish flu, there was TB outbreaks, etc which makes me guess that perhaps pink card may be health related.
DB