I was doing some plumbing last night, and didn't quite finish. I'm going
to be doing the last couple of bits after work tonight. Last night there
were a couple of solder-ring joints that I fluxed, assembled, but didn't
heat. Will the flux have done anything to them, meaning I need to
dismantle, clean, and reassemble, or can I just heat them up as-is?

Will look for your answers when I get home from work :-)

Cheers,

Pete