There's been plenty of effort spent into estimates of benefits fraud, and by all account it is a tiny problem. Yes, it should be dealt with. But currently, the problems universal credit and other defects of the benefits reforms are causing are outright killing people.
Benefit fraud is currently far down the priority list of things that needs to be fixed, and that even goes for cost: The government has pushed things so far that you can look forward to a lot of tax money going to cover legal costs as a result of the huge and growing number of lawsuits the government is losing.
The government is complicit in far worse breaches of legislation related to the benefits system than fraudulent claimants are.
Benefit fraud is currently far down the priority list of things that needs to be fixed, and that even goes for cost: The government has pushed things so far that you can look forward to a lot of tax money going to cover legal costs as a result of the huge and growing number of lawsuits the government is losing.
The government is complicit in far worse breaches of legislation related to the benefits system than fraudulent claimants are.