That garden looks very smart. Juniper? Juniper is a tree so not sure that the ground cover can be that. Maybe there is another plant called juniper I don't know of...
Edit: Juniper can be quite a low lying shrub. Now the question is, does your juniper produce berries? Great for cooking...
I don't know about the UK, but in the US, there are all kinds of Juniper varieties, from trees to bushes and ground covers. Mine do not produce berries, or at least it never has. That's okay, I don't like them, anyway.
CD