The other thing to remember is the following. It is important.
If you beat the odds and get a job, you will be offered terms and conditions that will make you question the sense of your £100,000 investment.
If you're a mature candidate you are likely to have a reasonable career, hence you must also build into the equation your lost income for the training years.
That £100,000 cost has now grown to £200,000.
Still feeling lucky? Still married?