Invited to a Graduate Assessment day at their headquarters in Thornton-Cleverly, UK. Began with a 40min introductory meeting about the company. Then went on a site tour for 40mins. Had a lunch break, then had a 1 on 1 interview with a senior process engineer and a HR member, lasting 45mins. Then had a technical assessment comprising of tackling an example case study on distillation columns and overall mass transfer calculations.