Basically, yes. Each of the 650 constituencies votes in a single member of parliament, even if they don’t get 50% of the vote, just more votes than anyone else. So if you have 3 constituencies that all vote 40% Labour, 35% Conservative, and 25% Lib Dem, you will get 3 Labour MPs, even though if it were proportional, you shpuld get at least 1 Conservative MP (sorry Lib Dems, too small a sample to let you have one too)

I’m surprised it’s both this early and this late. The fact that he came in second in Iowa and then dropped out before New Hampshire is baffling.