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With regards to gambling again, I will do that too! I will just use the same amount of money that I usually use when I play. I will not become a high roller just because, I won a lot of money, I will stay low bettor and hoping that I would hit that jackpot again. You can't quit easily in gambling when you win that amount of money, but t's good to just stay low bettor and don't risk your winnings on gambling again.
I too think that staying a low bettor is the best solution for him, because, let's be realistic, it's very hard to quit gambling completely after such a big win. I bet after several months of abstaining, seeing that a big part of his winnings is gone already, he might ask himself: "Where else can I earn such money?", and start gambling with the remaining part, risking probably more than £200k. Or, if he wouldn't start gambling, those thoughts would be bothering him all the time.
But if he allocated 5% of the won money to gamble with during the following 10 years, he would not lose more than £20k during that period of time, and would find peace of mind at the same time.