Sadly, you will be lucky to find a Kindle Voyage in the UK, save for secondhand on ebay.
The Pocketbook Touch HD 2 is easily sourced in the UK and pretty well satisfies most of your wishes, though I would not recommend any e-ink reader for pdfs. For epubs, the Pocketbook is a very good reader, even though the in-built reader app is a little basic. Installing the Coolreader fork app (see on this site in the Pocketbook section) improves things significantly, in my opinion.
As an owner also of an Android based eink reader (The Energy Sistem HD Pro) I would not recommend an Android eink reader. I managed to get mine to produce a pretty decent performance but not without quite a bit of messing. Whilst using the Android OS gives access to a whole range of ereader apps (although some readers do not come with the Play Store installed or easily installable), my experience is that a lot of those apps do not work well with eink (they are invariably built for an LED screen) - animations causing issues, page ghosting because of a lack of integration with page refresh and even loss of integration with the page turn buttons. From what I have read to date it seems even the newer Android 6 based readers seem to share some of these same issues.
If the presence of page turn buttons is not a "must-have" then Kobo and Kindle are obvious, safe and excellent choices which work really well straight out of the box.
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