As part of transitional arrangements put in place upon EU exit to ensure the GB BPR could operate in a GB-only context, GB-based suppliers of biocidal active substances and products were required to re-submit to the HSE applications for approval where the UK had not been the lead evaluating competent authority under EU BPR (owing to a centralised procedure under the EU BPR, one Member State can evaluate an active substance application on behalf of other Member States).