  We propose a novel scheme for the exact renormalisation group motivated by
the desire of reducing the complexity of practical computations. The key idea
is to specify renormalisation conditions for all inessential couplings, leaving
us with the task of computing only the flow of the essential ones. To achieve
this aim, we utilise a renormalisation group equation for the effective average
action which incorporates general non-linear field reparameterisations. A
prominent feature of the scheme is that, apart from the renormalisation of the
mass, the propagator evaluated at any constant value of the field maintains its
unrenormalised form. Conceptually, the simplifications can be understood as
providing a description based only on quantities that enter expressions for
physical observables since the redundant, non-physical content is automatically
disregarded. To exemplify the scheme's utility, we investigate the
Wilson-Fisher fixed point in three dimensions at order two in the derivative
expansion. In this case, the scheme removes all order $\partial^2$ operators
apart from the canonical term. Further simplifications occur at higher orders
in the derivative expansion. Although we concentrate on a minimal scheme that
reduces the complexity of computations, we propose more general schemes where
inessential couplings can be tuned to optimise a given approximation. We
further discuss the applicability of the scheme to a broad range of physical
theories.
