I am looking into the possibility of buying a kit to assemble, but have
come across this statement in the warranty Ts and Cs:

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
The use of acid-core solder, water-soluble flux solder, or any corrosive
or conductive flux or solvent will void this warranty in its entirety.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

My current reel of no-name solder is several years old, and I have no
idea whether it complies or not (but I suspect not).

What kind of solder should one use these days?

--
73
Ian, G3NRW