I'm bumping your question since no replies. Please feel free to ignore my opinions
I see in your profile that you have
Monk plus
Vidos
Philips SHE3800
I assume something must be lacking in those very decent earbuds. The one thing that stands out, at least for the Vido and SHE3800 is that they have cheap looking cable, plug etc. The Monk+ is a step up in that regard, but many of us prefer the others more. Before jumping from £2 to £150, consider a spending around £20 -£30 for an earbud a few steps up in audio and build quality. I didn't purchase any earbuds last year, and my recent purchases have exceeded my expectations. Maybe earuds are getting better? My recent purchases have turned some of my old favorites into orphans.I suspect that some of the high end audio purchases are due to conspicuous consumption. You can spend that £150, and get amazing build quality - cable, shell, plug, but how much better will it be in terms of function? For that £150 will they be more comfortable? Fit is the one thing that spending extra $$$ won't improve.
Good luck and hopefully someone more knowledgeable myself will provide some solid suggestions.