Please can someone help us, we have an old boiler Stelrad wlx rs60 boiler, about two hours ago it started making an awful highpitched sound like a smoke alarm but constant, so loud it hurts your ears. We panicked and turned everything off, decided it must be the boiler have switched it to off but pilot light is still on, we have ran hot and cold taps made no difference also bled radiators it is still screaming. We- my husband and I are know nothing about plumbing and are also penniless, we would really appreciate some help...thanks