  Malliavin calculus is implemented in the context of [M. Hairer, A theory of
regularity structures, Invent. Math. 2014]. This involves some constructions of
independent interest, notably an extension of the structure which accomodates a
robust, and purely deterministic, translation operator, in $L^2$-directions,
between "models". In the concrete context of the generalized parabolic Anderson
model in 2D - one of the singular SPDEs discussed in the afore-mentioned
article - we establish existence of a density at positive times.
