Increasing the complexity of both weather and climate forecasting modelling systems enhances prediction skills in coastal areas, where equilibrium assumptions between Earth system components break down. Additionally, it allows consistence between earth system components, enabling multi-hazard forecasting. We present recent advances in the regional coupled environmental prediction system developed in the UK through the release of the Regional Coupled Suite – UKC4 configuration. Besides upgrades to all model components, it includes a new Regional Atmosphere and Land configuration, an online diagnostic of rivers, 10mn coupling frequency, coupling to a biogeochemistry model, the possibility of running near-real time ensemble forecasts and climate hindcasts. We will highlight uses of the model, such as: process-understanding of marine heatwaves and quantification of their feedback on the weather,storm multi-hazard forecasting, marine tide impacts on weather forecasts and climate projections, storm impacts on phytoplankton activity, local feedbacks in regional climate projections atmospheric convection imprint on the ocean: meteo-tsunami forecasting