I half-heard an interview with a young Muslim woman on Today FM a few minutes ago and decided to find out for myself what Muslims really think of squat toilets. The first link is this Wikipedia page on the subject which states,
The Islamic faith has particular rules regarding personal hygiene when going to the toilet. This code is known as Qadaahul Haajah  and is extremely prescriptive. The rules were established during times before the invention of toilet paper or toilet seats. In many parts of the Muslim World, squat toilets are the norm and toilet paper remains rare and its use a matter of dispute.
It should be borne in mind that none of the following points is contained within the Koran and all are derived from hadith sources and the collected opinions of people throughout history. The Koran is silent on any of the issues below including issues of sidedness such as whether one uses the left or right hand, order of stepping into or out of toilet areas, or which foot stress is placed upon. The only issue which it does touch upon in relation to toileting, is the one of washing one’s hands especially following going to the toilet which is mentioned in verse 5:6 of the Koran.
I recall from the interview Ray D’Arcy asked the woman if the Koran said that squat toilets should be used. She artfully dodged the question by replying that Muslims use squat toilets all over the world, while also implying that it was in the Koran if I remember correctly.
As Islam is now the third largest religion in Ireland I think the sales of new toilets might be affected by future trends..