The ECHR should be behind this. The ECHR decision on Safe Harbour came about because Schrems wasn't satisfied with the relevant regulator's response (in that case Ireland). So if the ICO doesn't get their finger out then they also might be taken to court. I suppose the Treasury might be egging them on as well - the thought of 4% of the global turnover of Google or Facebook or MS. Mmmm all that data from W10....