Hi Histres
No, I haven't come across Beyer or Friedrich, but I did find some pork butcher Kramers living in Bradford in the mid 1800s, and I suspect they were related to the Sheffield Kramers. Hiller and Lang are the other names I have come across.
I haven't found a Charles Kramer who was a tea dealer, only pork butchers (father b1819 in germany, son b1850 in Sheffield). My attention was drawn to the Kramers because I thought they might help with my Ebert ancestors - Frederick Kramer (pork butcher) married Mary Ann Ebert (daughter of Frederick Ebert) in 1844 in Sheffield, and John Christian Kramer occupied the same butchers shop at 1 Pinstone Street that Frederick Ebert previously occupied. Also, John Christian Kramer's wife was born in Westminster at around the same time that Frederick Ebert lived in Westminster. I suspect John Christian Kramer and Frederick Kramer were brothers, maybe Charles too.
I've searched the Baden-Wurtemmburg land records that are online and have found reference to a Johann Michael Ebert as a miller in Hurden near Bachlingen in about 1795, and reference to a divorce application by Friedrich Ebert of Hurden in 1801. As 'my' Frederick Ebert married in Westminster in 1805, this could possibly be him, and I thought I had managed to order a copy of the document through the website - but my German is not very good and I find the site quite confusing - and they didn't ask for any money, so I'm not surprised that nothing has arrived.

I've attached the drawing of Pinstone Street below - I think No 1 would be the 2nd shop from the left. Charles Kramer later had a shop at 5 Pinstone Street. Yes please I would like to see the Kramer pictures, even though they are not directly linked to me.
Thanks
Kathie