I'm collecting the 60's LP releases on Japanese Tamla Motown (as well as the 45s and EPs!), which is roughly x100 titles oddly enough. I'm almost complete...the first couple of years was tough mind as I had no listing to work from! I used to search all the obvious artists until it boiled down to three five missing numbers...after much digging two turned out to be from Hugh Masekela, one from Sammy Davis Jr and the final two were actually non-assigned numbers with no clues as to what they may have been!
UK LP wise, I do find them over here including early Marvelettes, Miracles and Vandellas, but they tend to carry premium prices due to the 'novelty' of them being UK pressed! If anyone has a wants list for the tougher earlier numbers give me a shout!