UK based, can read both EPUB and AZW files?

Hi there,

I'm looking for an e-ink, backlight e-reader which can read both EPUBS and AZW without conversions.

I'd also really like to be able to have access to a huge range of books on the e-reader.

I'd like to be able to take out e-books from the library (EPUB) and put them on the e-reader.

My wife has a Nook simple touch. We can take out e-books from the library via the website, and transfer them via the pc. It also has access to a good range of books. HOWEVER, Nook have withdrawn from the UK market so that's not an option. Nor can we access Amazon books, which we would like to.

I know that Kindles only do amazon files, which means I can't withdraw the library books and use them on there without conversion. I don't want to convert them as I want to keep it as simple as possible, if it's too complicated then my wife will struggle with the process.

Kobo seems to be an option but I don't know what the online store is like. Also, it reads Mobi files, which aren't azw. So how would I get amazon files onto the device?

Are there any other options?

I'd rather not get a tablet.

Thanks in advance!