https://www.gov.uk/government/publications/high-stakes-gambling-reform-for-the-digital-age/high-stakes-gambling-reform-for-the-digital-age#chap1In general, this government agrees with the principle that people should be free to spend their money how they see fit, so we propose a targeted system of financial risk checks that is proportionate to the risk of harm occurring. Assessments should start with unintrusive checks at moderate levels of spend (we propose £125 net loss within a month or £500 within a year), and if necessary escalate to checks which are more detailed but still frictionless at higher loss levels where the risks are greater (we propose £1,000 loss within a day or £2,000 within 90 days). We also propose that the triggers for enhanced checks should be lower for those aged 18 to 24.
We would expect the credit reference agency would be able to provide an overview of pertinent information for the individual customer, for instance an estimate of overall disposable income, rather than providing all the raw data to gambling firms. Where this is not possible, information may need to be collected directly from the customer
So unless the concept of a bankroll is accepted, it is just a matter of time until UK midstakes cash and tourney players get shut down as they won't be able to evidence disposable income.