Thanks so much for the info! (y)
Managed to find a complete burner/pump unit from the same model so hopefully this will fix the (now squealing!) boiler.
Purely out of curiosity: what would be the negative affects of no/leaky burner cover be on a room sealed system?
Recently had a new oil tank installed for my Worcester oil burner.
The new tank is now at ground level so a deaerator device (Tigerloop brand) has been added, and with a new return line fitted to the original Danfos oil pump.
To get access to the pump for this new return line, they’ve cut a...