I have followed your suggestions.
So, it has now been 10-15mins and this is what I currently have:
The Central Heating light went on to start with and it remained ON for a few minutes and it is now flashing (intermittent) - for the last 10 mins or so.
Electric Power Supply (fixing light) remains ON permanently.
The heating came on and it is now running.
So, it has now been 10-15mins and the heat is running in my radiators and I have hot water and everything seems to be running ok.
Yet, the light indicators are as described above.
Which leads me to the folowing questions:
Can I consider the problem "fixed"?
Is it something that might happen again and/or that I need to be concerned about for in the future?
Is it something common, minor or something I need to talk to my landlord about?
Please let me know what you think.