Though both Max Farley and Bobby Davis were in the Intimate Revue band, I think the alto sax soloist on "Singing My Way Round The World" is more likely to be home-grown, either Philip Buchel or Leslie Norman. For one thing, the Musicians Union was clamping down pretty hard on freelance American musicians by March 1930. Buchel would be the more obvious choice, given his pedigree as a hot soloist - active at the time as a freelance musician, notably with Spike Hughes at Decca - but it doesn't sound quite like the Buchel who recorded with Hughes. I think Les Norman might be a better match. Listen to Les Norman's alto solo towards the end of "Back Beats", made a few years earlier:-
Hit-Of-The-Week is a card based record, similar to Durium over here (same company in fact - and the plastic coating used was also called "Durium"). Filmophone is a transparent all-plastic record. Many are now unplayable as they seem to be trying to return, albeit very slowly, to their former state - i.e. a blob! I bought one in the 1980s that was playable then (just) but it has now shrunk further and can't be played.
Now, as to whether the vocalist is Joe Leigh (listed as vocalist in The Intimate Revue programme) or Jack Hart (whose name is given on the Dominion issue as leader). Here is Joe Leigh singing with Alan Green's band:-