No, I was wrong (must be a first), Liverpool Street was further south. It was more or less along the line of PaulB's residence! This is the best I can find from the 30's.
Going back to solicitors, there was a great amalgamation during the 60's, 70's and 80's.
Lamberts were formed from Knocker, Bradley and Pain, which previously was Bradley, Chitty and Scorer.
I forget the chronology but Knocker, Elwin and Lambert is also in there somewhere.
Terry