Several science Working Groups (WG) were formed in 2019 within the Ariel Mission Consortium to help prepare the RedBook (Tinetti et al. ESA/SCI(2020)1), defining the science cases, and to contribute to address three fundamental questions 1) what exoplanets are made of; 2) how they formed and 3) how they evolve. Among those WGs, “Synergies between Solar System planets and exoplanets” was set-up to foster collaboration between the scientific community working on Solar System Planets atmospheres and the new growing community of the Ariel Science Team. We show here an overview of on-going studies and future projects foreseen by WG members, mostly focused on using our Solar System planets as proxies to develop and test tools to support Ariel science cases