Ryanair DO allow Visuals. There are some specific restrictions such as stabilised approach criteria being met, F/O experience level and so on. All quite reasonable. There IS a ban on self positioning night time approaches and rightly so after a 737-800 shaped hole was nearly left on a Spanish mountain, the GPWS saved the day. You may be vectored or use an instrument approach to get yourself to a straight in final, once you have the PAPIs in sight you can continue.