Queen of "I've done my research" really needs to do some research
2.5 tog really is for mid winter when it's minus temperatures outside, not a mild start of spring... 1.5 tog would be better, minus all the crap she's stacked his bed in. Also, the room temperature should be between 16-18 for ideal temp. Not 20+... its really not hard to find this guidance, the lullaby trust are very good at what they do and the NHS suggest looking at their guidelines nearly every time we see them.