Thanks guys. Having searched from all your advice I reckon it's very much like antirrhinum 'black prince'. It was growing on a bed of sand between some mortar in old slabs. Definitely able to grow in the most difficult conditions anyway. Potted up, fed and watered now hopefully get some life back in to it.
My vote is for antirrhinum. You won't get much life into it now, @g_2004_n1, because it's an annual and has dropped half its flowers. If you leave the seed pods on the plant until they are dry and brown, you'll see little holes open on the tip of them and you can empty out the seed. You can sow them straight away or keep them until the spring. The flowers won't necessarily be the same colour, because they could have been pollinated by another plant of a different colour. They sometimes survive over winter and flower for a second year. If you want to try this, cut off most of the plant when it's finished flowering, leaving a stump about 2-3" tall, and keep it in a sheltered spot.
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