is it too late to start a grow in the uk?

i already have some plants growing in my conservatry and greenhouse they are about a month and a half old but i got given some seeds a few days ago and i dont know wether its too late to plant um?

I know this is late, but the only things that determines if it's too late or not are the variety and light schedule. You could plant seeds even when it's late, even when there is a flowering light schedule. You just won't get near as much weed that way. Some people do it on purpose.