It's a good question and the short answer is that El Nino/La Nina does not impact Northwest Europe as much as it does in other locations.  Any possible connections tends to be through the stratospheric polar vortex. More on this from Amy Butler:  https://www.climate.gov/news-features/blogs/enso/el-niño-and-stratospheric-polar-vortex.  Also check out the new-ish climate.gov polar vortex blog which will keep you updated on all things polar vortex!