[blml] Revoke established?

[Steve Wright]

Trick nine: LHO leads a spade, dummy follows, RHO follows, declarer 
discards.

Trick ten: LHO leads a club. Dummy plays the only club left in the dummy 
in tempo without being instructed by declarer. RHO follows.

Declarer pauses briefly before saying, "Oops I have got a spade. I think 
I have revoked on the previous trick".

Is the revoke established?
-- 
Steve Wright
Leicester, England