Lloyd George is probably the least populist of the lot, and given his own personal baggage, it would be difficult for him to build a cult of personality in the 1930s-though one could argue he had it at the end of the Great War. As with all of these what precisely the government would be like is very much dependent on the circumstances that they come to power in, but assuming Lloyd George somehow becomes PM in the early 1930s after the depression hits, he would be pretty strongly in favour of implementing the proposals in his 'Yellow Book' which were very much similar to Roosevelt's New Deal. He was also a supporter of appeasement for quite some time, and was known to praise Hitler several times, so his foreign policy could very well be just as bad as Chamberlain's, if not worse.
Powell had a hard core following-but mostly after his 'Rivers of Blood' Speech in 1968. There are a couple of PM Powell TL's out there- the most famous being 'If Gordon Banks had played'. Some potray him as a qausi-fascist, which isn't all that accurate. What is more likely is that a lot of the monetarist reforms eventually pushed by Thatcher would get implemented a decade earlier, which could generate considerable unrest. I'm sceptical his immigration policy could be anything near as hardline as he might want it to be, as the Wets in his party would not allow it. Depending on the timing of his premiership, you might just end up with a severe recession and a group of core supporters who are largely disappointed by his failure to live up to the hype on immigration. He'd probably lose re-election, if his party even let him get that far.
It's difficult to say what precisely Mosley would be like as remaining in Labour would probably change his attitudes somewhat over OTL, but I think he always had certain authoritarian tendencies regardless of what party he was in. He'd likely concentrate power in a smaller inner cabinet of ministers- as envisaged under the Mosley Memorandum, and large scale rallies and speeches might very well be a hallmark of his campaigning style, as they were IOTL. Maybe some semi-nationalistic policies are pushed under the label of 'patriotism'. Other than that, a lot of the post-war nationalisations and Keynesianism that was adopted by the Attlee government would also be put into place under Mosley.
One important thing to remember is that Mosley was a protectionist. Pre-WW2 he saw the British Empire as the basis of a self-sufficient trade bloc, but after, he saw that it was in decline and so looked to Europe as an alternative. So strangely, it could be that Britain would be involved in the European project right from the start. Prime Minister Mosley could be regarded as one the main founders of this TL's equivalent of the EU.