One of the features of Trad Morgans is that in really cold weather, the metal coolant pipes contract just enough to allow a small weep from the joint with a rubber hose.
I had a long battle with my Roadster over a couple of winters because of this feature. This was made worse because the long pipe which runs under the nearside exhaust manifold is angled at the rear end and is not perfectly round.
Look behind the engine on the nearside, where you will find the water pump and thermostat housing, and a host of rubber hoses. One is a short straight pipe. With the engine OFF!, rub your finger around the joins..........
It could also be from the washer bottle.
