That's very interesting. I wonder if this is a regional issue. I've heard before that Netflix is much less awesome in a lot of countries than it is here in the US, but I'd never heard about how Amazon was doing overseas. I suppose since Amazon bought a UK-based Netflix competitor, it makes sense for them to support the UK better.
I'm sure LoveFilm's existing content deals must have helped. There used to be a site called Oric which tried to make it easier for people to find the content they want to watch online legally, which was easy to scrape to compare. Now I have to rely on a dodgy mix of sites like http://netflix.maft.co/, http://netflixukcompletelist.blogspot.co.uk/, http://uk.istreamguide.com/, paired with import.io and trawling Amazon's prime video site.