Hi Richard
I do so agree that later passenger lists are full of absolutely brilliant info, I sometimes wish that my family had arrived post 1900 because with my common family names, I could pick many arriving in the same year, from the same place with the same birth dates

Your last sentense of your message is exactly as I saw it.... George is Adolf and visa versa. You do not often see the birth place name on the census, it is generally just Germany for instance but in this case Wurtenburg was written just above. It is by no means definite as it all depends on who gave the information to the enumerator and as we know from records here in the UK and elsewhere, places change from census to census.
I truly believe that all the info from the databases confirm that the family in 1930 is your George, Marie and Hilda Frey, there are just too many coincidences

I haven't found the Lehmann's mainly because there are many but it might be worth looking for someone of that name born around George's age, I will give that a go

I did find it very sad when I saw the address for George Shaw's father, plus it looks as though he and his brother have changed their surname to a more English sounding one! You can check the passenger lists as they arrived in 1916, I have also found George and john with their parents Frederick and Louisa Schumm? both born Germany in the 1901 English census.
Kirkdale, Lancashire
RG13
Piece 3472
Folio 84
Page 33
I will look for other info and get back to you
Best wishes
Agnes