Under the 1982 Sale of Goods Act you have a right to a job done with reasonable skill and care. This does not mean perfection it has to be of the average for that trade or profession. I recall from somewhere that six years might be the limit for claims but in any event pointing should last...
I would have posted this on the gas-fitters page but access is denied.
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Dear Brothers. There is currently a debate on the plasterers forum in respect of bricking-up former fireplaces and placing a vent in the brickwork.
I once did this on a bedroom fireplace (as part of an improvement...
Assuming there are no other causes.
The condensation is a result of moist air shedding liquid onto a cold surface. Ventilating as you suggest will help if the moisture in your home is greater than the moisture in the air outside; the greater benefit will probably be from the fact that...
Get the builder back and get him to assess the situation. Diagnosis through examination is the route forward.
The other responses are disappointing.
Regards steve