  We present a detailed analysis of a new XMM-Newton observation of the FRII
radio galaxy 3C452 and its environment. We detect X-ray emission from the hot
intragroup medium and measure its temperature as well as obtaining the surface
brightness and pressure profiles. We provide evidence that 3C452 is currently
heating its environment, measuring a temperature of $1.18\pm0.11$ keV for the
immediate environment of the radio source compared to $0.86^{+0.13}_{-0.05}$
keV for the outer environment. We also present evidence that the outer regions
of the lobes are overpressured (internal pressure of $2.6\times10^{-13}$ Pa and
external pressure of $1.11\pm{0.11}\times10^{-13}$ Pa at the edge of the lobes)
and therefore are driving a shock at the lobe edges (with a temperature which
we constrain to be $1.7^{+0.9}_{-0.5}$ keV), while the inner regions of the
lobes are underpressured and contracting. Taking into account the very large
amount of energy stored in the lobes, we show that this relatively low-powered
FRII radio galaxy will have an extremely significant impact on its group
environment.
