Behind the cold front, which will tend to straddle northern England, sufficient insolation will be capable of producing a few scattered showers and isolated thunderstorms, particularly where low-level wind convergence provides some forcing accompanied by the best overlap of instability and shear during peak heating (particularly SE Wales/W Country - S Midlands - CS England). A low-end SLGT has been issued to better highlight this area, albeit instability is not overly-impressive. 

Some small hail may be possible with the strongest cells, along with the chance of a few funnels or weak tornadoes - especially close to the surface low centre. Slow storm-motion may cause some temporary localised surface water issues.