Posted: 17/07/2016 at 19:52
If the garden was well maintained the best thing you can do is to sit back for 12 months and see what is there.
Keep on top of the obvious weeds, pruning, etc. but don't just go digging stuff up until you are sure what has actually been planted.
Long time to wait I know but if the former owners were gardeners, it will pay you to wait and watch