Right click, inspect element, change your balance to anything you want.
I've never had 300 large, would it be normal to keep that in ones current account?
No, but wherever you did keep it, it would be reasonably straightforward to evidence (unless Nazi gold etc).
I once had £250k in the current account, very briefly, are re-mortgaging. It made me feel rather nervous.
@ChasnotRobert started
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I've never had 300 large, would it be normal to keep that in ones current account?