Mermaids has to file accounts. The accounts to March 2020 were filed in January 3021 and say on p32:
“Mid-June 2019 Mermaids was made aware that information from internal communications was available online. Although the breach was quickly contained, this resulted in a front page story in a national newspaper. The need to inform those affected in a timely manner as well as
addressing the reputational risk was urgent. Additionally it was clear that a thorough review of this incident plus interrogation of all other data processing functions within the charity was required. Mermaids took this incident very seriously and immediately sought professional
advice on all aspects, including legal support and data consultancy. Thankfully Mermaids was in a financial position to invest in the best services available, to help secure the future of the organisation.
The exceptional costs from this incident are included in legal costs and amount to £158,029”
The “those effected” does perhaps conflict with their statements at the time.