You should have your boiler serviced every year buy a fully qualified gas safe engineer. This is really important.
Watch out for small puddles of water around radiators or under sinks. It might be just a coincidence or the laundry drying. However call your plumber out or at least give him a ring.
Plumbers are nice people and most will be more than happy to give you some advice over the phone. In the long run it will be cheaper as redecoration is timely, expensive and annoying!
Please phone us for any queries or help on anything 24 hours a day on 0208 964 6714.