Found it a bit hard going today...too much wine over the weekend!
28A. After work I learn about one that causes inflation (7) A*R*I*E
29A. Messenger going in hope flew over mountain top (6,6) *D*I*G *I*E*N
Yes indeed, retro. When the weather's OK, we have a brisk walk over H. Heath for about an hour, most weekdays if we're around. Weekends tend to be too crowded in the spring and summer.