Earlier, DFC discusses whether the 1800m visibility restriction for an IMC holder is to be interpreted as being applied for the purposes of the approach ban in the same way as an IR-holder would use the published minima, or whether the restriction applies even once an IMC holder has passed below 1000' on an approach.
I couldn't find anything in the AIP, but I did find the relevant legislation in the ANO.
Schedule 8 Part B contains the privileges of the IMC rating. Included in this is the following:
(2) The rating shall not entitle the holder of the licence to fly:
(b) when the aeroplane is taking off or landing at any place if the flight visibility below cloud is less than 1800 metres.
Note that it does not ban you from taking off and landing; it bans you from
flying under certain conditions.
The legislation relating to the approach ban for non-commercial aircraft is in the AIP, and it's also in the ANO Part 5, paragraph 49(4):
(4) Without prejudice to paragraph (2) an aircraft to which this article applies when making a descent at an aerodrome to a runway in respect of which there is a notified instrument approach procedure shall not descend from a height of 1000 feet or more above the aerodrome to a height less than 1000 feet above the aerodrome if the relevant runway visual range for that runway is at the time less than the specified minimum for landing.
I don't think there's any doubt that the 1800m is "relevant", although it is a vis, not an RVR, so might not apply for the purposes of the approach ban? Also, I don't see anything in the approach ban which would override the general ban on flying when landing in less than 1800m vis.
So, in conclusion, I'm not really sure, but I think DFC is probably right. But, as IO540 says, it's completely academic in any case.
FFF
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