What can I substitute for Angostura bitters?

[Phar Lap]

Liquorland was closed so is there anything I can use as a substitution for Angostura bitters? As tomorrow will be very hot, I'm going to cook the corned silverside in the slow cooker tonight. Other ingredients are grated orange rind and fresh thyme which we have.
Thanks in advance ladies.

(P.S. Have posted this in the General forum too as not sure which is better.)

[vinnyd]

Fee Brothers makes a bitters they call Old-Fashioned Bitters which is along the lines of Angostura, but I doubt you have that on hand.

So, nothing. The corned beef will be fine.

[Phar Lap]

Thanks Vinny. I'll use my regular recipe then.