Yes it is.
[b:3p8u3d4p]There are no exceptions to the Ts & Cs printed on the voucher.[/b:3p8u3d4p] It covers cask. It covers Of Foam & Fury. It covers Table Beer (now officially called Via Maris, btw). It covers pilot brews. It covers growler fills (max. 3 vouchers).
If a voucher is refused:
a) Put it back in your pocket: you can use it again.
b) Tell us here so we can direct the owners to the problem.