Pullup,
You are getting confused, if you follow the published arrival to the IAF and then the ILS this is an IFR approach, can't be anything else, nothing to do with radar vectors or airport size etc. If once established you elect to continue visually, (Day only of course, unless you're a bat and can see the terrain at night1) that is another matter and the requirement is to be stabilised as one former comment highlighted. Ryanair have no ban on visual approaches, infact as one comment made, the final segment of the npa is visual. What is "exploitation manual" never come across this, JAR says OMA/OMB etc. Company restrictions will be in Part A or Part B.