I had one local plumber measure from the sink above the stopcock and another from BT used the outside tap. Both had a measuring device.
I also measured later myself with a beaker and stop watch, and it was around the same rate.
I've been given conflicting opinions from different plumbers about the type of boiler to have installed (which seems the norm reading through the threads), so would greatly appreciate some advice. Some suggest a combi as my flow rate is only 10 L/m and others suggest an unvented cylinder with a...