Meteorological conditions — IFR flight
57.  Where a relevant aircraft is to be operated in accordance with the Instrument Flight Rules, the pilot‑in‑command —
(a)must not take off from the departure aerodrome unless —
(i)the meteorological conditions at the departure aerodrome are at or above the aerodrome operating minima for that operation at the time of use; and
(ii)the current meteorological reports, or a combination of current reports and forecasts, indicate that the meteorological conditions at the aerodrome of intended landing, or at every alternate aerodrome selected in accordance with regulation 35 or 36 (as the case may be), will be at or above the aerodrome operating minima for that operation at the estimated time of use; and
(b)must not continue beyond the point of in‑flight re‑planning unless paragraph (a)(ii) can be complied with.