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No air bleed by the HW cyclinder. I've got an engineer coming Thursday - don't think I've many more options to try

I've opened the drain valve and the cold water feed was flowing freely. The pump is running even when the boiler shuts down - I guess an airlock is a possibility bu all the radiators have been bled.

I have an Ideal Elan boiler which is 18 years old. When the bolier comes on it makes a knocking noise then shuts off soon after. Water comes out of the expansion tank overflow - looks like a circulation problem. The pump has been changed. The last time the system was working only half the...