One of the most popular, and in my opinion, most talented of the British Invasion solo acts was Donovan Philips Leitch, known simply as Donovan. He had several monster hits both in the UK and in the US in the mid 1960s, and many people recognize the music but not necessarily the artist.
His style was more folk than rock, and I personally believe that if it had not been for Bob Dylan Donovan would be remembered as the greatest folk singer of the 1960s. Fortunately, he is still with us and has a talented progeny as well.