Oops sorry! Yeah a lot of air came out of one of them, then water. Water came out of the others pretty much straight away.
Most of it doesn't apply as this boiler doesn't handle the hot water (for some strange reason there's a second one to do that!). I'm pretty sure there's no problem with the F&E.
Unfortunately the OP doesn't say if he cured the plane noise.
I tried to record the noise on my phone but it's not come out very well! Link to MP3
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