But the rule that we're discussing here is actually the Glide Clear rule (despite the confusing title of the thread), and there is never an exemption from that rule.
Well actually...
Rule 5 (4) exempts aircraft from all parts of the rest of the rule, including the glide clear rule, for the purpose of taking-off, landing or practising approaches at a licensed aerodrome in accordance with normal aviation practice.
Without that exemption, instrument approaches on Runway 05 at Cambridge, for example, would be nigh on impossible. For those of us who live within the congested area on the final approach track, there is no comfort in Rule 5.
