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Unvented cylinder reply
It looks as if some part of your house is fed from the combi boiler, and the rest off the Unvented cylinder.
The easiest way to work out what is what is run the hot tap in the part of the house that is working. If the tap comes on the front of the boiler on the screen that means it's fed off the combi. If it doesn't and gets hot then it's fed from the cylinder.
I suspect that your main bathroom would be fed from the Unvented cylinder, hence why you might have no hot water.
Thank you, I can confirm that it must be an unvented tank issue as the tap symbol doesn't come on when I use the master bathroom taps.
Would this need an engineer? Or is there way I can look into this myself?