Woodford Wherry not fermenting

[beebrew]

I have started a Woodfords Wherry kit 3 days ago and it has not fermented (no bubbles at all coming out of the air lock). I followed the instructions exactly. Whats gone wrong and can I get it to start fermenting? HELP Please

 

[GavH]

Three possible outcomes:

1 - It's stuck. Wherry is infamous for sticking at 1020.
2 - It's done. My Admirals Reserve fermented out in less than 3 days.
3 - It's not started yet. Perhaps the supplied yeast hasn't been viable?

A gravity reading will confirm at a glance which.