They're far harder to find than I anticipated! I managed to get the old Tamiya Churchill kit and I'll be find with it once I can figure out how to paint it. But I also need appropriate crew figures, as the uniforms of British tankers changed from WW2 to Korea.

Hi
Late war pixie suits are fine for Korea

When I built mine for a Korean War display reading the old Osprey Vanguard Churchill book indicated that the crews originally wore battledress with leather jerkins, the pixie suits only arriving later.

Any pixie suit wearing British figures would be fine as Korea was a "come as you are" war and lots of World War II issue stuff that shouldn't have been there was there.

Example of a pixie suit?

Those two sets are exactly what you are looking for.