scented geranium

I do not think this is blight because of the wooly stuff. Sounds like root rot which is pythium or rhizoctonia - brown round soil line yellow leaves and in wet conditions a whiteish/grey webby growth is visiable.
How have you been watering them? do they stand in water and have you over done the nitrogen on this plant? Improve soil drainage, remove diseased plant and drench the soil with fungicide. Get disease free plants. Good luck

This could be grey mould fungus, botrytis cinerea, wet conditions, as above, water the soil only with cheshunt compound.

Thanks for suggestions , as far as watering goes I am inclined to neglect this due to it being a geranium (certainly not overwatered) it gets lots of sun being in a conservatory it seemed to like it cause ti bloomed its head off! ! however it was somewhat potbound , ---now I read this back im surprised it survived at all lol ~

Was the conservatory humid? This will cause it. Why not try potting it on in new pot with fresh compost and keep the nitrogen low. Sometimes things survive when we think they wont.

It could be root mealy bug: I have seen this pest before on some pelargoniums.remove all compost from the roots and repot using clean pots.

Suggest you take a few cuttings just in case.

Root mealy bug sounds familiar, any way have repotted and taken cuttings .
Thanks all for your advice.