An online meeting organized by the The British Crystallographic Association (BCA) and the British Association for Crystal Growth (BACG) took place 29rd March 2021 till 1st April 2021. Bart Vorselaars was invited to give an online talk, titled ‘Nucleation of NaCl from an aqueous solution using the seeded simulation method: critical sizes, rate estimates and their uncertainty’. He presented results obtained with his research collaborations.