Sorted. Turns out a small section of seal from flue got corroded. The engineer replaced that and so far no leaks.
Funny thing - he noticed that there was a gas leak from the gas meter. Called out national grid, another one comes in and fixes that as well. Wonder how old that gas leak may be, as...
We only moved to this property early this year. The previous owner told us that she got this serviced every year but I don't have any paperwork.
Can't believe how hard on luck we are right now wrt boiler.
I am experiencing a slow leak from my Worcester greenstar boiler. The leak comes from the right side of the boiler. The water is cold. I do not see any loss of pressure nor there is any issues with radiator heating/hot water.
The leak is intermittent. It's not constant.
I just don't understand...