Thank you for the diagnosis. I had an engineer come round to have a look at the boiler earlier today. The diagnosis is that the fan is damaged.
I have had it replaced and warmth and hot water is back.
Thans once again.
Thank you for the response.
My knowledge in things like this is like none (bless me :( ).
So far I have only gone by what the plumber/Corgi engineer guy did the last time I called someone out to take a look at this same boiler. That time,k the pilot light used to come on and off at...