Thanks RG. I'm not up on modern styles to be honest.
Many years ago, mid 80's I think, there was a lot of re-modernisations going on in Liverpool. A house around the corner from me was having new windows installed and, because it was one of the birthday of one of the builders, they all scarpered off to the pub for the afternoon leaving 2 apprentices/labourers to fit the windows. Standard type wood frame with a top transom. Now, I don't know if you are old enough, but when I went to primary school, we had windows which had a small section at the bottom, which opened inwards to let fresh air in but keep the rain out.
Well these guys left behind fitted 2 windows upstairs in the bedrooms and one at gf level for the lounge. Only problem was, they fitted them upside down and inside out! So, the transom was at the bottom, (acting like the ones in school many years before), however they had the transom opening outwards. End of the afternoon and they lock up and go home, (the others were still in the pub), but they had left the two bedroom windows open, which merely acted like a bucket and collected the rainwater that fell that night after they had gone home. The following morning saw the windows being taken out and the lounge and hall ceilings being ripped back down where the rain had got through the floorboards and soaked the plasterboards.