Tengu
If you want to get familiar with Sika then get down to the RSPB Reserve at Arne, near Wareham in Dorset. There are literally thousands of Sika in the Purbecks and you will probably see around 200 in one go during a visit to Arne!
It's easiest to park at the RSPB car park situated just before the village of Arne itself. Then make your way to Shipstal Point (a viewing area over Poole harbour) either through the woods, or via the track (bridleway) at Arne Farm if you prefer a level hard surface.
If you time your visit for early morning or the quiet of the evening - and a low state of tide - you will see all the Sika moving out onto the saltings to feed. There is even a double-decker hide set up north-west of this viewpoint which allows you very good views of the deer - oh and the birds too!!
The Sika at Arne are so used to people that they basically ignore you unless approached. I work all over the Purbecks and see deer every day but nothing can beat Arne for sheer numbers of deer in one place at one time!
Hope this helps.
Bob