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kidgreen 'I have then opened and closed plastic cap on the top of the air bleed valve that sits behind the pump' The grey cap situated behind the pump it the AAV is it not?

You are correct about the clear tube that was hanging from the top of the Heat Exchanger, it is the bleed point for the hex. The little lever/tap it is attached to spins around and will release air/water from the heat exchanger. Be very careful if you are to operate the tap, ensure you have a...

You mentioned opening and closing the air vent behind the pump. This is the Automatic Air Vent and should not be 'closed'. It needs to remains loose/open'. That may explain the rising pressure and subsequent loss of pressure.