An occluded front bringing cloud and outbreaks of showery rain across northwestern Britain and Ireland will breaks up allowing insolation in the afternoon and this will help to generate 200-300 J/kg of CAPE. This meagre instability combined with surface convergence and some orographic lift could generate a few heavy showers. Like the last few days, overall shear is weak (a little better in the northern Scotland area) and profiles remain very moist, so lightning seems only a very low risk at this stage.