I don't have a link to hand (although I should do, the amount of times it's been discussed on here!), but it's
recommended in the AIP that you use absolute minimums of 500/600ft for precision and non-precision approaches respectively as an IMC rating holder. However... it's not in the ANO, hence it's not a legal requirement.
If it
is a legal requirement, then I'm in the !!!! for starters. I flew a number of ILS approaches to under 350ft last year
