For IFR arrival into YSBK from the W, you will usually get a WATLE 5 ARR which is a track WATLE to SY VOR, taking you towards 2RN radio mast, which is the VFR approach point and when you talk to BK TWR.
Your next reporting point is (generally) at the racecourse, and depending on which RWY is in use, you will need to be at 1,000 or 1,500 Ft.
Keep a good lookout between WATLE and 2RN - it gets busy out there, and there will also be inbound traffic from Prospect Reservoir as you get closer.