Uneventful, but not sensible, as a reject before CDP would probably not end well if no visual reference - and you could not be sure of meeting Rule 5 (3) (a)
I don't understand what you mean by that. Rule 5 doesn't apply when taking off or landing, as per Rule 6:
Exemptions from the low flying prohibitions
6 The exemptions from the low flying prohibitions are as follows:
(a) Landing and taking off
(i) Any aircraft shall be exempt from the low flying prohibitions in so far as it is
flying in accordance with normal aviation practice for the purpose of:
(aa) taking off from, landing at or practising approaches to landing at; or
(bb) checking navigational aids or procedures at,
a Government or licensed aerodrome.
(ii) Any aircraft shall be exempt from the 500 feet rule when landing and taking off in accordance with normal aviation practice or air-taxiing.
5(3)(a) is in respect of low flying en route, i.e. disallowing pilots from flying in the lower part of the avoid curve, which might otherwise be attempted over open land or the sea.