Just a word of warning to anyone looking to sign up for the service after the free trial; Amazon appears to have serious issues streaming its HD and UHD services. All too often there are drops from 24bit/96kHz to 'Standard' without any explanation. Worse, what Amazon call 'Standard' is sub-Spotify/Apple Music quality and immediately obvious.
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I'm on the three month trial and I've had this happen every weekend afternoon so far. When the service works as advertised it's good and worth the £14.99/m, but it doesn't appear to be capable of meeting demand at peak times and I'm not impressed. It's been widely reported on various forums, including Amazon's own.

I'm on the three month trial and I've had this happen every weekend afternoon so far. When the service works as advertised it's good and worth the £14.99/m, but it doesn't appear to be capable of meeting demand at peak times and I'm not impressed. It's been widely reported on various forums, including Amazon's own.