Nice one Haz 
I had to do similar except that it wasn’t online gambling. It was the £500 arcade slots instead, so I had to fill in the forms etc to get myself excluded from the local adult gaming centres. I was never a degenerate, but things had to stop as I wasn’t seeing much disposable income since last year’s Autumn statement. What gets me is that it wasn’t the category of gambling that Theresa May was targeting (£500 slots). She was meant to be targeting those bookies table games (blackjack, roulette etc).
I’ve done online gambling for a few years though (Video Slots and Royal Panda) with limits imposed and I’ve never had a problem with those. That’s because when the monthly money is gone, it’s gone, and I’m not tempted to take those limits off. The other thing is not to sign up to a 3rd site, because if I do, then where does it stop?