[Closed] Which noise cancelling headphones?

£100 isn't much in this field, some of the best in the market are the Bose ones but there are plenty about. Pop in to Currys and try some as it's a popular feature on high end headphones these days.

consider decent in-ear monitor phones - they attenuate all sounds whereas noise cancelling invert the phase (roughly) of the sound and only really work well with constant sounds. Plus they generally have better fidelilty than active noise cancelling phones.

Plus you can sleep with iem phones in, whereas you can't so easily with the over-the-ear headphone types.

I have slept successfully with some etymotics on in a room of 18 snoring (non-) civil engineers

As TurnerGuy says, get IEM's. For the money, the very best you can get are Shure SE215's. Reason being, they sound fantastic, they sit comfortably inside the ear, and if you use the triple-flange eartips, they attenuate to -26dB, which is as good as any ear-protectors. Also, and I can't overstate how important this is, the cables are very easily replaced!
They can be used with either a heavy-duty regular cable, or a more flexible one with a large remote control.
Also, the cables have angled plugs, making them very resistant to damage when stuffed into a pocket.
I can't recommend them highly enough, and you can wear them in the street without everyone thinking you look like a tit trying to be a shit-hot DJ! 😉

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http://www.amazon.co.uk/Shure-SE215-In-Ear-Isolating-Earphones/dp/B004U9NH3E/ref=sr_1_2?ie=UTF8&qid=1384904086&sr=8-2&keywords=shure+se+215
http://www.amazon.co.uk/StoreONE-Replacement-Silicone-Sleeves-Earosonics/dp/B006ICE7F8/ref=pd_sim_ce_1

£100 seems a bit excessive for just noise cancelling, and as I have a habit of destroying earphones by vacuuming the ear pieces off, dog/cats pulling on them or just treading on them... I baulked at the £70 I paid for some MMip70's & the damned jack wore away and died (I claimed on the warranty that time!). £300 esure are never going to be on my shopping list, that's for sure, and even a £100 seems a lot of cash for something so fragile.

I've gotten some RHA MA150s, cheap as chips at £11 delivered from Amazon, at that price there almost disposable (spare rubber earplugs/sleeves for those esure's at £4!). I found the RHA ear pieces to be very comfortable and they come with three sized ear plugs so will fit, and exclude any external noise (did so, for me). No little bag or the textile cord leads like MA450's though, but my MA450 did cost 4 times as much. What they do have are the nice rubberised leads that I first came across on the more expensive Sennheiser's, that seem less likely to tangle. Sound is a deeper (bassier?) than my 450's from the word go, but again at a quarter of the price what do you expect. I'm hardly an audiophile though & listen to more audiobook than anything else (so of little consequence to me)
I did manage to break my 450's (jack again), but RHA sent me out a replacement pair and a free post envelope to return the broken ones (not sure you'll get that with these TBH), the replacement pair had a 90° jack, which seem to be more durable IME.. oh the 150's have a 45° jack which is a little weird, being neither one nor the other but doesn't seem to pull out as easily as a straight one.

Cheap as chips and do the job... maybe not exactly what the OP wants though.

I have a set of these, sensible money and work well (obviusly not as well as 250-300 Bose but well enough for the 12hr flights I've done.

[url= http://www.amazon.co.uk/Audio-Technica-ATH-ANC33IS-Active-cancelling-headphones/dp/B00CL3TAOQ/ref=sr_1_1?ie=UTF8&qid=1386086177&sr=8-1&keywords=noise+cancelling+headphones ]Audio Technica Headphones[/url]

Plus you can sleep with iem phones in,

Not wanting to get all "elf an' safety" but I know someone who did that and had to go to the medics to get it removed in the morning.

Just saying like.

These look smart and get a good review off What Hifi* [url= http://www.whathifi.com/review/klipsch-mode-m40 ]Klipsch Mode M40[/url]

[url= http://www.amazon.co.uk/Klipsch-Mode-M40-Cancelling-Headphones/dp/B005N8A4Z0/ref=cm_cr_pr_product_top ]Big Discount on Amazon[/url]

*for what it's worth

Not wanting to get all "elf an' safety" but I know someone who did that and had to go to the medics to get it removed in the morning.

Eh? How on earth would something the size of those Shures up there ^^ get stuck and need medical help removing?
Or do you mean the person wearing them realised they were still in their ears when they woke up, yanked them out, and left the silicon eartip behind in their ear?
It's no more likely an eartip would get stuck overnight than it would after wearing for five or six hours during the day.
The Mee Electronics M6 Sport phones I use at work are much thinner than most IEM's, and sleeping in them highly practical.
http://www.meelec.com/MEElectronics_M6P_Stylish_Earphones_p/earphone-m6p-mee.htm
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Currently going for $34.99, I was wearing a pair this afternoon while running a folding machine; I've checked the background noise from ours with a level meter on my phone, supplied by Ultimate Ears, and it backed up official levels at 89dB. With the M6P's in, and music playing at a normal volume I can hear detail perfectly, while background noise is totally unobtrusive.