This boils down to the regulations regarding "minimum equipment for IFR" of the country in question.
For UK this is laid down in Schedule 5 of the ANO.
Relevant for approach phase is "Scale H".
[Quote]
(i) Subject to paragraph (ii), radio navigation equipment capable of enabling the aircraft to be navigated on the intended route including:
(a) automatic direction finding equipment;
(b) distance measuring equipment;
(c) duplicated VHF omni-range equipment; and
(d) a 75 MHz marker beacon receiver.