Yes, the pressure gauge is in a housing above the boiler. The red thingy mentioned earlier also lives in that upper housing, and has the letters W+P on it along with some other inscription that I will try to read now.
Normally, when the heat demand comes on, we hear the boiler fire up, and a constant sound that i presume is the pump. Both the firing up sound and the constant pump noise are now absent
As I was trying to read the inscription on the bottom of the "red thingy" (which I now suspect is a pump), the boiler came alive....... .....boiler firing up sound and all. Went on for about a minute, then stopped again.
The bit on top of your boiler is a purpose built bit of kit for classics called a sytem kit .. The big red thing is an expansion vessel which basically takes the place of an expansion tank in loft
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