Nah, vulnerable customer data isn't being shared en-masse between different industries like you are making out. A vulnerable customer for a gas & electricity supplier isn't always the same for say a water company either. Different industries (and even different companies within) have different requirements to be classed as vulnerable.
Your data will be stored on our secure systems. We’ll only share it when necessary, with those who supply your electricity, gas or water – such as:
If contact one utils provider they should info all other utils providers of that address issues. There is no harm to informing each of your utility providers of the issue at that address, in fact it advisable to do so because it just a should.
What has Ovo Energy got to do with Water?
I never tried stated it was on mass. I advised it good idea to tell each of providers.
Should means should not must.
Water companies for example have a target number of customers who need to be classed as vulnerable, so you'll find the criteria for many companies being relaxed to "hit the target".
Sorry I dont know of set target number that exists, tryied but can not find one at Ofwat but they are keen for Water companies to share information on PSR to other utils.
I did bit skimming throw there last report that I can find from 2016. Unable to find later one.
Page 13 (PDF page 14)
3. Partnership and adopting good practice is important, whether with other
utilities or third party organisations.
Representatives of water companies stressed that it was very important to
collaborate – or partner with – other utilities and third party organisations to identify
and assist customers in vulnerable circumstances. For example, involving third
party organisations in staff training helps to ensure that they respond
knowledgeably and sensitively to those customers needing specific assistance. In
addition, partnering with other utilities and third party organisations can help to
identify accurately the assistance required and signpost available resources to
ensure that the customer receives the most appropriate support.
The definition of who is valuable customer is same for Gas/Electric/Water/Telcoms they all comes under same set laws.
Care Act 2014
Safeguarding Vulnerable Groups Act 2006
Health and Social Care Act 2012
Mental Capacity Act 2005
Equality Act 2010
Human Rights Act 1998
Data Protection Act 2018
Public Interest Disclosure Act 1998
There few other laws, statutory instruments and case law But this would go on and on....