Old Compost

[mrbiffo]

Hi everyone. i would like to ask some advice on compost.
As i have a small garden and i grow everything in large pots and grow bags for spud
what i would like to know is when i have harvested all my veggies
can i re use the old compost as it seems a shame after all the cost.
so would the kind people of the grapevine shed some light on this matter
many thanks
kind regards in advance
mr biffo
kevin