there are a number of safe practices that would be in breach of the 500ft rule such as 'offshore shuttling' and 'HEMS operations' - both of which are currently permitted (conditionally) below 500ft.
JimL; though in Jarops 300ft is the min cloud base for HEMS, I don't think the CAA have issued any UK AOC HEMS operator with an exemption from the ANO 500ft rule.