I agree with JimB that this circuit is hazardous. Why not use an old cell-phone charger or similar to provide a safer low voltage supply?
R5,R6,R7,T1,T2 draw current which causes a voltage drop across R1 and R3. If their only purpose is to provide a power-on trigger pulse for the 555 then there are easier ways to do that (e.g just a cap from TRIG to GND and a resistor from TRIG to Vcc).
Edit: Why no smoothing capacitor directly after the rectifier bridge? Why are C1 and C2 connected across the AC supply?