Cinnamon roll crumble cake

I had to eat this earlier today as part of my duty mentoring a friend's son.  He is on the Duke of Edinburgh award scheme and for the service part, he is baking a cake for the church café every week.  Up until now I have been sent weekly photos, but this week I was given two pieces to bring home.  One for me and one for my husband - part compensation for all those cakes I bake and take away to the same café.