I spent the first nine years of my life within smelling distance of the old Saltley gasworks ( site of a famous strike) and one of my first jobs was at Aston between the ketchup factory and the brewery. So gassy and malty smells remind me of those times, but I wouldn't say I miss them! We have a ceanothus in the garden in flower at the moment which smells of caramel- very dangerous for someone with a sweet tooth who's trying not to put any more weight on. (I don't mean I eat the flowers, just that I have a craving for a sticky pudding with caramel sauce instead of some healthy fruit!)