Hi, I hope someone can advise. I'm using this website for the first time. We have just moved into our first home. I'll follow the format I have seen some others use: 1) Boiler STRATA 38 wall mounted ultra high efficiency condensing boiler. The booklet says 'Model 38 boiler & the 38/46 Combi' 2) Problem There are 3 toilets in the house (1 downstairs, one in main bathroom and one to the en-suite). When the toilet is flushed in the main bathroom, the pipes make a long , loud prolonged noise. When turning on the basin tap I noticed that the noise stops but as soon as I turn of the tap, the pipe vibrations/noise continues (in total when flushing the noise lasts for 30 seconds or so). Notably this happens from the main toilet when flushing but also when using the basin in the en-suite there is some noise although not as bad. A friend suggested bleeding all radiators, from upstairs, going downstairs (as the boiler is in the kitchen). I did this last night but hasn't made much difference. In the main bathroom, when flushing the toilet the loud noise from the pipes seems to be contained within that bathroom, can feel vibration under the floor. We really need to address this quickly, I am obviously concerned. Prior to buying the house we had a plumber check this out, he must have just turned on a few taps and confirmed that there wasn't a problem. Flushing the toilet is causing this moreso. Before I call out another plumber, would appreciate your feedack and advice. Thank you in advance.