Trifle !! Jelly or Not ???

Yes I remembered the list !!- but I soon got tempted by the M&S twin meal offer and couldn't resist the  Strawberry Jelly Trifle .
Ok it might not look good......... but it tasted great !!!
I have decided that this has to be my next kitchen challenge - to make a trifle  but should it have jelly in it or not ????