Flybe forbid it, as did BAConnect etc beforehand. Company policy for all types.
Neither a take-off nor an approach and landing is to be carried out in actual freezing rain or freezing drizzle conditions. In practice this implies:
a. Before departure if the destination is actual, or forecast to have, freezing rain or freezing drizzle then two alternates must have landing minima and no freezing rain or freezing drizzle.
b. If, when airborne, the ATIS gives freezing rain or freezing drizzle then no
approach can be made to that airport until the condition has cleared.
c. A take-off is not permitted during reported freezing rain or freezing drizzle