Outdoorsy Shite: Android OS Mapping

[SheepAreSuper]

DP has a Galaxy S2 and for his birthday I've promised to buy him some OS mapping software with 1:25000 maps for Snowdonia and the Lakes.
I have an iPhone with OudoorsGB (and said OS maps) which I love but it isn't available for his phone.

The intention at the moment is to go for ViewRanger. Are there any other android based apps with considering?

I don't have an android phone, but there is a thread lower down with a couple of links that might be useful :)

www.mumsnet.com/Talk/the_great_outdoors/1438626-Can-I-get-OS-maps-on-my-android-phone