If you were to die owing money to power companies, loan companies, credit card companies etc, the fact that 'their' money was in your bank account would be irrelevant. They'd still be able to claim it from your estate.
Similarly, the fact that other club members' money is in your account wouldn't deprive them of their legal right, upon your death, to get their money back. They simply need proof that you owe them the money. Go to any traditional office stationer's shop and buy some proper savings cards. Ensure that they're filled in every time that someone gives you their money and then everyone will have proof of how much is owed to them.
Alternatively speak your bank manager about opening a separate account. (To the best of my knowledge, all of the major High Street banks offer free banking to clubs). You'd need to draw up a very simple constitution and convene a minuted meeting (in practice taking about 30 seconds out of your coffee break at work!) to get yourself appointed as Treasurer, with someone else as Secretary.