This year we were given a diagram from the mariner we got the boat from and i showed you should go past diglis junction and down past the weir into slack water before doing a 180 turn
Edit: to add. If the OP is thinking about getting off the Severn at Worcester and into the basin at Diglis, be prepared for the turn towards the locks. Some maps/diagrams make it look like a 90+ degree turn off the river, but you actually need to continue downstream past the lock entrance and then make a 180 degree turn to get alongside the lock landing facing upstream. The two Diglis locks between the river and the basin are manual, user operated and are wide locks with big heavy gates. Slightly confusingly, the manned lock on the main river downstream of these is also called Diglis Lock.