My Worcester 40 cdi boiler has started leaking for the past 2 days, a constant drip drip leak, losing around 2 litres a day, the boiler pressure hasn't changed and the boiler is still functioning ok.
The leak is coming from the part labelled with an arrow on the photo. What is this and how easy is it to repair? Roughly how much should it cost to be repaired by a plumber?
Thanks for any help