  Let $G:={^2G_2}(q)$ be the simple Ree group with $q=3^{2k+1}$ and $k$ a
positive integer. We show that the centre of the principal block $Z(kGe_0)$,
where $k$ is an algebraically closed field of characteristic $3$, is not
isomorphic to the centre of the Brauer corresponding block $Z(kN_G(P))$, where
$N_G(P)$ is the normaliser in $G$ of a Sylow $3$-subgroup. As part of the
proof, we compute the conjugacy classes of elements and the character tables of
the maximal parabolic subgroups of $G$.
