My instinct is to feel that teaching Reception and Yr1, for example, together in one room with one teacher cannot possibly be as effective as having separate classes tailored to each year group. Can any primary teachers or parents with experience of this give me some insight? There may be advantages to doubled-up classes, or at the very least no evidence of it being detrimental to the children, but all I can see from my perspective is the disadvantage of having so many disparate abilities and needs in one room.