This may be fun.

Some may recall my battle with #NHS who refused to update my email address as only 6 characters. I sold the domain I was using and raised with ICO where literally someone else was getting notices about appointments and medications. ICO said NHS has “correct email address” (a lie). I even took to parliamentary ombudsman who said ICO did nothing wrong (another lie). #GDPR right to correct personal data is clearly ignored when it is the NHS!

I had given up. But …

@revk It's mad that the sole, inviolable source of "what is your email address?" is you, and it is merely six characters long, and yet the ICO can somehow declare you are wrong. That they can not require any organisation to store the correct six characters.
@_aD It was infuriating.