You need a lawyer mate, nobody should interfere with a flue or any
associated part of a flueing system unless qualified to do so! From
what you said it sounds like the council have behaved unlawfully and
should be made to answer for playing with peoples lives, carbon
monoxide kills, take photos of everything , contact CORGI 01256372300
explain it to them and find out who the spanish equivalent of them are
and phone them. you might not even need a lawyer, they ****ed up your
boiler and left you and your neighbours in an unsafe situation, people
might die.