Gardeners Question Time on Radio 4 have a weekly podcast.
I've subscribed to this as I am normally at work and don't work in the sort of environment that facilitates listening to the dulcet tones of Radio 4 (20+ Learning Disabled Adults in one room doesn't always make for a peacful Friday afternoon

) Besides they'd probably laugh me out of the room and get it back onto Radio 2!
It's a general gardening show, but as there is a current 'trend' for veg growing there is a good amount of advice to be had.
(and Bob Flowerdew's Dad used to be my Headmaster at Primary school! You really needed to know that didn't you

)
Enjoy your hard earned Ipod.
Lorna x