To be honest......

......it would probably be easier to start again from scratch because all the original herbs are long gone, only the self-seeded hebe (the pot originally contained rosemary I think!) and the mint look worth saving......and, come to think of it, the hebe needs transplanting somewhere more sensible......hmmmm, I feel a trip to the garden centre coming on......

EDIT : but after a later kind offer of free herb plants on FB from neighbour-Paul-2-doors-up it might just be for the potting compost ;-)