As S-D says, a very small number of Freeview boxes include an RF modulator which converts the output from 'AV' (which is what goes into a Scart socket) to 'RF' (which is what goes into an aerial socket0 in the same way that VHS video recorders offered both types of output. (Indeed, if a VHS video recorder accepts either a Scart or 'phono' input, it can still be used as an RF modulator to connect between a standard Freeview box and a TV's aerial socket).
However, very strictly, the use of any device capable of handling colour signals (even if the output of that device is then fed to a B&W TV) requires a colour TV licence. So people who were using a VHS video recorder with a B&W TV set were (at least in theory) required to have a colour TV licence. The same ruling applies to Freeview boxes (but I've never heard of anyone with a B&W TV set being prosecuted, or forced to get a colour licence, simply because it had a 'colour-enabled' device feeding a signal to it).