Where the pilot has advised of a hydraulic failure but is able to confirm to ATC that the defect will not normally involve any serious difficulty in effecting a safe landing, then a Local Standby fits the bill.
Errr, not quite.
It all depends on what's in the aerodrome's Emergency Orders and thus in the tower's MATS Part 2. Ours states that an a/c suffering
any hydraulic failure will be subject to a Full Emergency.