Have a glow worm gas boiler.

The flue is leaking, quite badly, in to the boiler, so much so that I've shut down the boiler to avoid any damage, internally.

Had a quote of above 1,000 euro to replace the first 2m of the flue, including one elbow.

Have no idea if that is a fair price or not, and from a look online, parts don't seem too expensive.

Anyone that offer a ballpark on a flue replacement - acknowledging that a full assessment needs to be done for precise quote, and job sizes can vary but just a ballpark for flue and its fitting, would be much appreciated