you'll be lucky if anyone is willing to replace that flue, its a boiler off wall job, and the one mentioned earlier will be different, thats a balmoral if im not mistaken
to be honest the amount it will cost to have the flue replaced, you'll be better off replacing the boiler
It is a balmoral bud.
I had one about 4 weeks ago with intermittent fault with flame rectification.
It's had gas valve and PCB in recent years. Cost the landlord a fortune. My heart bled naturally